This ad ran in Facebook tonight. My gut tells me I wasn't really the 10,000th visitor to a Facebook application (even though "10,000th" in blue was mighty convincing). But I could be wrong. Want to find out? Here's the web page that appears when I click the ad. If you follow it and there's actually a free 16 GB iPod touch at the end of the line, it's yours.
My prediction: From the barely readable disclaimer text at the bottom of the page, I'll bet it's one of those virtually endless co-registration offers aimed at the masses. If so, I'd wonder whether Facebook has any real ad approval process (see definition of false and misleading advertising). Either way, please shoot back a comment and let us know what happened. Thanks.