In an interview last week, Greylock partner David Sze said he thinks a celebrity content management system will be a big business. “It used to be when these platforms first started, the top users were always digital stars — the Kevin Rose and Robert Scoble types. If you look at it today, there’s an amazing shift going on — it’s all general celebrities and the scale is order-of-magnitude multiples of when the tech stars were dominating the system.”

As I’ve described it before, WhoSay is a social media tool for celebrities, aimed at “helping them manage their social media presence and making sure photos and videos are posted on a page the stars themselves can control and eventually monetize.”

For instance, here’s a picture of Tom Hanks’s refrigerator, via an embed code that allows the actor to maintain the rights to his image. Hanks also used WhoSay last week to bitch about how RSS feed readers of Gawker’s headline about his new movie might think he was actually dead. (Tom Hanks knows what RSS is?!)

Greylock has one of the most extensive venture capital portfolios of the leading social Web companies, among them general and open platforms like Facebook, LinkedIn, Pandora, Airbnb and Tumblr. WhoSay, by contrast, is a much more specific publishing tool.

WhoSay — which was incubated by Creative Artists Agency but operates independently — had already raised $6 million from investors including Amazon and High Peaks Ventures. Greylock is adding an undisclosed amount into a previous Series B round.

This mock fitness video by late-night television talk show host Jimmy Kimmel is so funny that it made BoomTown do several spit-takes watching it.

It is for a product called “Hottie Body Humpilates,” and includes a bevy of glam Hollywood actresses–including Scarlett Johansson, Jessica Biel, Eva Longoria, Sofia Vergara, Jessica Alba and also a perfect turn from Lindsay Lohan–doing bad things to an exercise ball.

Enough said.

Enjoy:

Here’s an interesting online video, in which a passel of celebrities urge young people to vote.

It begins with them urging youth not to vote, in that hipster, sarcastic, of-course-we-really-mean-you-should-vote-you-dope tone.

The nonpartisan PSA–well, honestly, it does lean decidedly liberal–has been produced by actor Leonardo DiCaprio’s Appian Way and includes DiCaprio, Jennifer Aniston, Dustin Hoffman, Eva Longoria, Forest Whitaker, Ellen DeGeneres, among others.

Also, inexplicably, comic Sarah Silverman taking off her bra to prompt young people into civic action.

And if that’s not reason enough to prompt you to register to vote–deadlines are looming for the upcoming election–and get to the voting booths on Nov. 4, BoomTown does not know what is.

Here’s the video:

Here are videos of three of the new “I’m a PC” ads from Microsoft’s next phase of its Vista-doesn’t-bite advertising campaign.

You can decide if you like them or not. But BoomTown is declaring them a vast improvement on the quirky initial commercials that featured Microsoft Founder Bill Gates and comedian Jerry Seinfeld.

Microsoft has insisted that those three ads, which attracted a chorus of critics, were just a “teaser” to this second phase of a $300 million ad campaign, in which the software giant seems to be returning from its short visit in hipville to a more normal marketing message.

And these new Microsoft (MSFT) ads are definitely normal and more clear, having an it’s-a-small-world-after-all panoply of people declare that they are all PCs.

The message is aimed at attacking the more elitist message of Apple (AAPL) ads, which have effectively mocked PC guy relentlessly over the years as an oaf.

In Microsoft’s ads, its own PC guy complains at the start of each that “I’ve been made into a stereotype.”

The ads proceed to show regular folk with some celebrities mixed in (including Gates, TV hottie Eva Longoria and feel-good author Deepak Chopra), all proudly declaring their PC affiliation.

While the ads feel like they are tapping a little too much into that uneasy red-state-blue-state vibe–as if we need more of that–they’re also nicely done, thankfully, although not particularly new or innovative.

Which, after the Gates/Seinfeld oddity, is a good thing.

Here are three of the new ads (click them all at once for an even better experience!):

While the very quirky ads recently rolled out by Microsoft to tout itself–starring Microsoft Founder Bill Gates and comedian Jerry Seinfeld–got a ton of hype, it turns out there will be no more than than the three already released for now.

It seems the churros have gone cold.

According to a Microsoft (MSFT) spokesman, the Seinfeld advertisements were apparently just a warmup for more to come tomorrow, though the new ones will not use Seinfeld in any significant way.

But they might still feature Gates and Seinfeld could return.

But the main Seinfeld/Gates pairing was, said Microsoft, just a “teaser” for the next phase of the $300 million campaign to tout its beleaguered Windows Vista operating system.

[UPDATE] Said Microsoft in an official statement: “We will be executing the second phase of our advertising campaign tomorrow, as planned from the start.”

The company said upcoming personalities in the new ads will include feel-good author Deepak Chopra, television star Eva Longoria and musician Pharrell Williams, and they will also use Microsoft’s own version of the dumpy PC guy character to attack Apple’s hugely successful Mac/PC ads.

BoomTown is dubious, to say the least, that Microsoft can be more clever than Apple (AAPL) in the marketing arena. And by dubious, I mean its chances are as good as Lehman Bros. rising from its financial grave.

News of the development was first reported by Valleywag, which said in its post title that the ads were canceled, which is untrue.

But Microsoft’s rep stresses that this was the plan all along, to jump-start the marketing conversation, even though the ads have, in fact, not gotten a lot of praise.

You be the judge. Here are the three ads. The first with the churros joke and the second and third visit with a family, combined: