In the No. 1 spot was the California District Court ruling on gay-marriage voter initiative Proposition 8. Uploaded by GoodAsYou.org shortly after the ruling came out in August, the document was Scribd’s most viral ever. The start-up provided a timeline showing how it was spread (image embedded; click to enlarge).

We should note that Scribd did not provide a list of docs ranked by number of views. CEO Trip Adler said such a list would be dominated by random items that have good search engine optimization, like a scan of an Indian phone book that has long been one of Scribd’s most-viewed documents of all time. Scribd, which now has 60 million monthly uniques, attributes much of its growth to its improvement of social sharing features.

The No. 2 most-shared doc on Scribd in 2010 was the surprising claim of proof of the computer science problem P ? NP from earlier this year. Uploaded by Vinay Deolalikar of HP Research Labs in August, the paper seemed to show that a class of computationally intensive problems could not be solved using simple algorithms.

In the third spot was the Republican political platform “GOP Pledge to America,” uploaded in September by CBS News. The draft lays out policy principles on the economy, healthcare and national security.

I find it interesting that Scribd’s most social documents are more often notable for newsworthiness than timelessness. The United States Court of Appeals for the Ninth Circuit heard oral arguments earlier this month appealing the Prop 8 decision that was posted on Scribd. And as for P ? NP, while many computer scientists believe the claim in the paper on Scribd is correct, the proof itself is not seen as conclusive.

The rest of Scribd’s 2010 social docs list is a similar mix of newsworthy documents and research, as well as a little levity, including a list of 25 macaroni-and-cheese recipes.

1. California Prop 8 Ruling (Good As You)
2. PNP 12 pt (Angelica Lim)
3. GOP Pledge to America (CBS News)
4. Scribd in HTML5 (Scribd)
5. A Statement to the Viewers of Countdown (Brian Stelter)
6. Marijuana Is Safer (Chelsea Green)
7. Cognitive Biases–A Visual Study Guide (Efern211)
8. Using Facebook to Move Your Business Forward (Facebook)
9. 25 Mac & Cheese Recipes (Gooseberry Patch)
10. Influence and Passivity in Social Media (Hewlett-Packard)

25 Mac & Cheese Recipes by Gooseberry Patch

[UPDATED: H-P exec Todd Bradley has been a public company CEO, which I reflected below correctly.]

With Yahoo board Chairman Roy Bostock reportedly assuring investors and others that the company will have a CEO in place by the end of the year, it seems prudent for BoomTown to initiate an official Yahoo CEO Countdown.

After all, this column had a 100-Day No-Sacred-Cows Vision Quest to mark the time that Jerry Yang said he needed to give Yahoo a top-to-bottom look-see when he took over last summer as CEO.

Yang announced he was stepping down on Nov. 17, prompting the search for someone to lead Yahoo (YHOO) to the promised land where BoomTown countdowns are illegal.

But that’s not today, so here’s the 26-days-to-go update:

It looks like Yahoo has almost no chance to nab a top candidate, News Corp. (NWS) COO Peter Chernin. While Yang made nice and Bostock quickly lobbed in a call to get the well-known exec to come in and talk, several sources said Chernin declined even that.

Of course, moguls like Chernin are pros at not interviewing–one media player schooled me that you apparently never show interest in a job and only take it if a full offer is made, because if you don’t get it after chit-chatting, you look like a loser.

But I don’t think it is a slick feint on his part, even though Chernin is now engaged in contract renewal negotiations at News Corp. (which owns this Web site).

Consider: If you were Chernin, would you want to trade your powerful, well-paid, glamorous job in Hollywood and New York for what will surely be a slog of a job in Sunnyvale, and in a cubicle?

And Chernin has told many he is not interested in doing the job, although News Corp. would still love to do some sort of deal to combine its online assets, like MySpace, with Yahoo’s, as it almost did many times.

While Chernin did just take delivery on a Tesla, showing some clear geekiness, and he would be an exciting get for Yahoo, it’s the longest of shots.

The same is true for some other names that have been floated (by me!).

But several of the people are on the Yahoo board’s list too. And while things can change, it is more unlikely any of them will be the pick.

That includes former Yahoo COO Dan Rosensweig, who has a good life now as a media investor; former eBay exec and OpenTable CEO Jeff Jordan, who told his investors he does not want to be in the running and was sticking with the start-up’s IPO plans–if and when the economy recovers (although Yahoo could buy OpenTable and, thus, Jordan); former eBay (EBAY) CEO Meg Whitman, who could be running for governor of California; and former AOL CEO Jon Miller, who is not secretly buying Yahoo, but who could not be its leader anyway, since he is bound by a Time Warner (TWX) noncompete agreement until the end of March.

Another sticking point: The Yahoo board has limited the pool by a list of six criteria that it has drawn up, with the No. 1 being a CEO candidate has to have public company CEO experience.

If enforced, that nixes some folks, like Google (GOOG) exec Tim Armstrong. In addition, Yahoo President Sue Decker getting the nod is even more unlikely, for that and other reasons, according to many.

From my lists, that leaves DoubleClick head David Rosenblatt (his company is now owned by Google); Demand Media’s Richard Rosenblatt; former Viacom (VIA) head Tom Freston; former CNET CEO Shelby Bonnie; Hewlett-Packard (HPQ) exec Todd Bradley; and Juniper Networks (JNPR) CEO Kevin Johnson, who was the Microsoft exec who was key in the Yahoo takeover attempt there.

All have reasons not to either want or be able to take the Yahoo CEO job, so that means there could be a dark horse candidate. (I am now drawing up yet another list of qualified public CEO tech and media execs).

Here’s one: Yesterday, after it was announced he was stepping down from Microsoft (MSFT) in the wake of its hire of former Yahoo tech star Qi Lu as its online leader, I noted that I liked Brian McAndrews for the job.

Plus, the former CEO of aQuantive, which Microsoft bought for $6 billion last year, would be a delicious irony. But those who have talked to him told me McAndrews–who did want the digital head job at Microsoft and was left hanging by the software giant’s CEO Steve Ballmer–seems intent on taking time off now.

Alternatively, one of the two Yahoo board members, Maggie Wilderotter or John Chapple, both have the public company CEO checked off.

Personally, I am betting on one of them as CEO, although I believe it would be better if Yahoo picked a fresh outside choice.

So do a lot of execs remaining at Yahoo, most of whom visibly roll their eyes at the idea of a board member taking over, considering the record of the directors so far in guiding Yahoo’s fortunes.

That’s why the board–which definitely has not distinguished itself by any criteria so far in Yahoo’s long fall from grace–should try to get it right this time, as Yahoo can’t take any more of the way it has been running the show so far.

Thus, the official BoomTown MicroHoo Countdown Clock!

Useful for both Yahoos (YHOO) and Microsofties (MSFT) alike, it will give everyone an idea of just how long this takeover battle has dragged on and on and on and on….

William Shakespeare said it best: “I wasted time, and now doth time waste me: For now hath time made me his numb’ring clock; My thoughts are minutes.”

Wow, totally us too!

Also, for you cretins, here is Madonna, in her music video for “Hung Up,” saying essentially the same thing as Will: