A friend of mine sent this ad to me – on the top, you’ll see an ad that says:
, You Have 2 New Unread Messages
One Of Your Friends Has A Secret Crush On You. Find Out Who!
Combine this with the "CONTINUE" button next to it which matches the Facebook interface, and you get something pretty nasty. I assume that in the case where the ad network passes in your first name, they are able to personalize this message.
As I’ve said in the past, ad people come up with some very creative stuff – I still consider the geo-targeted Adult Friend Finder ads to be some of the most technologically advanced stuff online right now.