Like it? Hate it? Why?

Facebook has launched a feedback feature for ads on its site, reports robwebb2k.

Each Facebook ad now comes with a pair of "StumbleUpon style thumbs," he writes. Rating a Facebook ad "thumbs down" results in the ad being changed.

When users rate an ad, a pop-up feedback window asks why it was either liked ("interesting," "relevant to me," "good offer," "other") or disliked ("misleading," "offensive," "pornographic," "irrelevant," "repetitive," "other").

Ad feedback is currently only available to a few users, said All Facebook.

But its arrival is timely. This weekend, prominent video blogger HappySlip told fans, including 34,000 MySpace friends, that she shut down her MySpace account, alleging Google AdSense repeatedly served ads soliciting Filipina women on her profile page.

The AdSense account is registered to MySpace, which can block inappropriate URLs at will. HappySlip's attempts to contact MySpace in April were left unheeded.

Adrants ruminates, "If you're using free sites like YouTube and MySpace to build your brand in the first place, to whom does your content belong, and do you have the right to decide what ads are served around your profile?"

Facebook's ad feedback function suggests advertising is as accountable to users as any other feature on a social network.