That’s the general description of Twitter’s plan, according to people who have been briefed by the company.

Here are the very broad strokes:

• Ads will be tied to Twitter searches, in the same way that Google’s (GOOG) original ads were. So a search for, say, “laptop,” may generate an ad for Dell (DELL). The ads will only show up in search results, which means users who don’t search for something won’t see them in their regular Twitterstreams.
• The ads will use the Twitter format–140 or fewer characters–and will be distributed via the third-party software and services that use Twitter’s API. The services will have the option of displaying the ads, and Twitter will share revenue with those that do.
• Twitter will work with ad agencies and buyers to seed the program, but plans on moving to a self-serve model like Google’s, down the road.

The caveats: Everyone I’ve talked to cautions that the plans are evolving and that there are plenty of details to work out. Including a launch date, though it seems as if the first half of this year is a very safe bet.

But at first blush, this seems like a relatively straightforward way for Twitter to get into advertising, without upsetting its growing user base: You won’t see the ads unless you use Twitter to search for something, and Twitter’s advertisers will have at least a vague idea of what you’re interested in.

There are lots of gritty details that Twitter either hasn’t worked out or hasn’t disclosed to the people I’ve talked to. For instance:

• How will advertisers buy and price the ads? Will they use a Google-like cost-per-click model or something else?
• Twitter searches are popular, but very crude. Can Twitter refine them to make them more useful to users?
• Google’s ads work because Google has reasonably good idea of both users’ intent and identity. Twitter knows much less about its users. How can it gather enough data to make its targeting more meaningful?

Twitter has been careful not to position its ad plan as the core of its business. And the company has made a point of stressing that its initial ad rollout, like other initiatives it’s launching this year, are merely “tests.”

That’s one of the of ideas behind the $100 million funding round Twitter closed last summer–it gives the company the time to play around with different business models. But this one seems to have plenty of potential.

Google (GOOG) stock has lurched five percent lower in the first few minutes of after-hours trading, as investors digest the news. If you want to anthropomorphize the market, you might speculate that it’s bummed that CEO Eric Schmidt and company didn’t show a higher revenue lift. But if you’re keeping track, revenue is up 17 percent compared with last year, and up 12 percent from the previous quarter.

Here is Citigroup (C) analyst Mark Mahaney’s “cheatsheet” for those playing at home (click to enlarge):

And you can see the company’s profit and loss and balance sheet here.

Google will be using YouTube to livestream its earnings call, but I’ll be providing some annotation here starting at 4:30 pm Eastern. You can also check out the company’s accompanying slide presentation here, and here’s a chart it’s particularly proud of (click to enlarge):

I’m trying out a promising new liveblog tool, but please bear with me if there are bumps along the way.

On the call: CEO Eric Schmidt, CFO Patrick Pichette, product guy Jonathan Rosenberg, sales boss Nikesh Arora. No Larry or Sergey.

Schmidt declares that he’s very pleased with Q4: “An extraordinary end to a roller coaster year.”

Schmidt: Clearly, we were right to start ramping up investments and will continue to do so. We’re investing in people and investing in tech based on our “70/20/10″ rule: 70 percent in core products, 20 percent in new business like mobile/Android, and 10 percent in “long view” initiatives like commerce and social.

And of course, more mergers and acquisitions. We’re continuing on a pace of roughly one M&A per month, some small, some big.

Pichette runs through the numbers in the release above. He reiterates Schmidt’s line about continuing investments.

Jonathan Rosenberg has a cold, but gets his message across: “We made some very hard decisions” to shut down some products to focus on winners. It’s our “more wood behind fewer arrows approach.” We’re focusing on DoubleClick integration, Android expansion and the Chrome OS. “YouTube, is in fact, monetizing well,” and we hope our partners make money, too.

Obviously, going forward, we’re going to plow resources into search. But other stuff too. Social, for instance. Not just social networking, but all of our products should be “social.” This can apply to search, local search, etc. We’re also focusing on commerce, whether people are making their purchases online or offline.

More Rosenberg: Mobile is important, and so is moving enterprise to the cloud.

Arora: We improved throughout the year, and Q4 was strong. Large companies like Staples (SPLS) and Volvo are directing an increasing portion of spending online [as they're supposed to do].

Arora: Search ads are always a value in December! Costs go up but they get more effective because people buy more.

Arora: Brand marketers are increasing their spending too. YouTube has had many successful brand campaigns. Have you seen Fox’s “Avatar” ads? They’re great. Other shoutouts for Sony (SNE) and American Express (AXP).

Arora: Most of the top networks have signed onto AdX ad exchange since we launched it in the fall.

Time for Q&A.

Google’s U.S. revenue had a big jump, but international revenue did not accelerate as quickly. What gives?

Arora: In the U.S., we saw large advertisers shifting offline to online. Other markets have different issues; hence, the different growth rates.

Are we back to normal in regard to seasonal patterns? Also, can you talk about “materiality” of mobile?

Pichette: We won’t talk about mobile revenue in any concrete way.

Arora: There is some different performance by vertical. Finance, obviously, isn’t as strong as it used to be.

Another question about mobile: Is Google trying to push revenue? Profitability? Also, please talk about China.

Rosenberg: Advertisers are starting to figure out what works on mobile. For instance, adding a phone number or an offer for mobile helps a lot.

Pichette: Regarding mobile, we want to drive innovation that in turn drives people to the Web, which is better for us. That’s the core engine of mobile.

Schmidt: “China stuff has been well-covered in the press,” the CEO notes before recounting the China story. “We’re in conversations with the Chinese government,” and our business has remained unchanged. “But in a reasonably short time, we’ll be making some changes there.” That said, we’d still like to be in China.

Missed a question. Apologies.

Please talk about outperformance of network business vs. owned and operated. Also, what accounts for higher marketing costs?

Pichette: Nothing to talk about re: network versus O&O. Re expenses, we said we were going to ramp up investment and we put in more there because we can track the results and the return on investment.

Arora: Yep, some of that money was to support consumer launches.

You said search increased five times on mobile. So what does that mean for revenue per search? Also, please talk more about increased spending on marketing.

Pichette: We’re really pleased with the marketing experiments we’re running.

Rosenberg: Regarding mobile, the new formats, targeting tools and reporting we’re giving mobile advertisers is making a huge difference. But I won’t answer your question about revenue.

Missed another question here.

YouTube monetization: Can you give us some metrics on how much inventory you’re selling?

Arora: Nope. But it has “gone from being a nice-to-have” to essential.

Pichette: The Youtube homepage nearly sold out in Q4. Hope that’s useful.

Can you break out ad spending by advertiser size?

Arora: Large advertisers are moving online, which is good. Retail was strong in Q4. We’re working with smaller advertisers to “bring them into the fray.” But the discrepancy so far has been mainly seasonal.

Can you rank your core businesses in terms of growth potential? Also, what’s up with you and Apple (AAPL)?

Schmidt: We’ve been saying for a while that display is a big opportunity. One story you haven’t seen so far is how successful we’ve been in display, but that will come out in 2010. [Note to PR staff: Start pitching!]

And obviously, mobile is small now but will grow quickly.

“With respect to Apple, it’s probably better to say”…that as a former board member “I have a special spot for Apple in my heart.” They’re a very well run company and “they have some very good stuff coming” strong competitor, etc.

Schmidt on Nexus One: What it is really about is a new way of buying a phone. Nexus One itself is the first in a series of examples where you can buy the phone online and pick your carrier.

Is Bing having an impact on cost per click?

Rosenberg: We think out CPCs are generally not affected by competitors. Prices are set by buyers.

Can you talk about Nexus One’s impact on margin?

Pichette. Not really. We want to innovate, etc. Nexus One will have its own margin and that’s how we’re focused on building the business.

We’ve seen third-party data on mobile projecting that iPhone could account for 50 percent of mobile traffic. Does that make sense to you? Also, you have said that the Apple relationship is “stable.” So what are the odds that you’re going to continue to provide search on the iPhone?

Schmidt: We won’t talk about the market share of Apple. And we won’t “speculate about any deals of any kind–true, not true, rumored, not rumored.”

Given that new display products are so great, is there any notion that people are moving dollars from search to display?

Schmidt: Advertisers “don’t shift, they add.” They might maximize search to maximize revenue and they might spend on display for long-term growth, branding, etc.

Pichette thanks Googlers listening for all their hard work. There’s an auxilary call at 6 pm Eastern with Pichette and Rosenberg, but I won’t be able to cover that one.

Reporting third-quarter results after market close Thursday, Google (GOOG) topped estimates, posting net income that rose to $1.64 billion, or $5.13 a share, from $1.29 billion, or $4.06 a share in the same period last year. Net revenue for the period ended in September rose nearly one percent to $4.38 billion. Excluding items, earnings for the quarter were $5.89 a share. Consensus estimates had been calling for $5.42 a share and $4.24 billion in net revenue. The chart below shows revenue sources within Google (click to enlarge).

Impressive. Seems paid clicks grew 14 percent compared to the same period last year, and four percent compared to the prior period. Cost per click was down six percent year over year, but up five percent sequentially.

“Google had a strong quarter–we saw seven percent year-over-year revenue growth despite the tough economic conditions,” said CEO Eric Schmidt. “While there is a lot of uncertainty about the pace of economic recovery, we believe the worst of the recession is behind us and now feel confident about investing heavily in our future.”

Good to hear. Google’s shares, which have already risen more than 50 percent in the past six months, are on another upward tear. They rose 1.82 percent to $539.27 on the news in after-hours trading.

Earnings call highlights via The Wall Street Journal’s Andrew LaVallee:

4:32: Call starts. The cast is the same as last quarter: Mr. Schmidt, CEO; Patrick Pichette, CFO; Jonathan Rosenberg, SVP of product management; and for the first time, Nikesh Arora, president of global sales operations and business development. But there’s a twist–they’ll be using Google’s moderator to vet questions with voters. They vote on “the most relevant questions,” which go to the Google execs, the operator says.

4:35: “While there’s obviously a lot of uncertainty about the pace of the economic recovery, we believe the worst of the recession is behind us,” Schmidt says.

He adds that Google now has the confidence to invest “heavily” in its future. “It’s all good news from our perspective, at least in looking at the quarter.”

4:37: Says “we want to really get to the perfect search engine” and that many advertisers would like to spend more with Google if the company’s product allow them to do that.

4:38: Schmidt says “we’re open for business in making strategic acquisitions, both large and small.”

4:39: It’s Pichette’s turn. “At a high level, we’re very pleased with our Q3 results,” he says. The quarter benefited from growth in AdSense for content and display initiatives.

4:41: U.S. revenue up 4% to $2.8 billion. U.K. revenue decline affected by foreign exchange as well as ongoing macroeconomic weakness, Pichette says.

4:42: Operating expenses rose from the prior quarter, mostly due to payroll, equipment and facilities-related expenses.

“We believe the worst of the recession is behind us,” he says.

4:44: Brazil was a standout in Latin America, Arora says. We’re beginning to see signs of recovery in Europe and Africa, particularly Spain. In Asia, China performed strongly as an emerging market.

4:46: Looking at the display-advertising business, those have also shown strong results, he says.

On YouTube, new advertisers and partners are helping with monetization efforts. Ninety percent of the top 50 advertisers have run YouTube campaigns with successful results–recent examples include McDonald’s and Hewlett-Packard.

4:47: YouTube has signed deals with all four major record labels and several independent labels. Earlier today, Google announced a partnership with Channel 4 in the U.K., which will bring full-length programming to the video-sharing site.

4:48: Arora adds a personal shout-out to the sales team.

4:50: Rosenberg calls the new AdWords front-end one of the company’s biggest investments of the year. Advertisers have new reports, can run more efficient campaigns and can get new features faster thanks to the platform, he says.

But Marianne Wolk, an analyst at Susquehanna Financial Group, one of the few outright bulls on the stock, asserts that eBay actually has a variety of options which could unlock substantial shareholder value. In a research note this morning, Wolk runs through a variety of ways that eBay could potentially re-energize the Street about the stock:

• Boost the value of PayPal through a strategic partnership with Google (GOOG). She notes that PayPal and eBay have massive amounts of data on consumer online shopping behavior that could be tremendously valuable in terms of ad targeting. “With PayPal’s conversion and spending data, Google could significantly improve ad targeting, raise click-through rates” and increase cost per click rates, she says.

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There was just a glimmer of news at the event, though it wasn’t surprising or pleasant: The Times’s Web business is falling away, day by day.

Digital head Martin Nisenholtz said revenue at his unit had been OK until the last two months of the year, but that there had been “softness in November, accelerating into December…next year is going to be a different year, by a fairly profound margin.”

Bear in mind that the Times’s digital performance pre-November was grim to begin with–digital revenue grew just 4.3 percent in October–and it becomes possible to imagine that digital revenue will decrease for at least part of 2009.

Nisenholtz didn’t do anything rash like attach any numbers to his comments, but he did add a little bit of color: His About.com unit, which is boosted by cost-per-click/search ads, is still doing OK-ish. But the business of selling display ads to Times Web sites is getting pummeled, and could be “under great stress” next year, he says.

So if About.com is doing (comparatively) well, why not sell that asset to help the paper escape its cash crunch? I asked CEO Janet Robinson that question after the event. She did everything but insist that the paper would never part with About.com, and praised it up and down–“an extremely important part of our digital future,” etc.

But given a couple chances to do so, she never explicitly ruled out a sale. Given the paper’s position, I don’t think she can.

[Image Credit: 1962 NYC Newspaper Strike photo from Life/Google archive)