Facebook has a new ad model...
"The new Sponsor
Stories ad unit will initially be placed in the third position within
each user's News Feed - as either a small banner-like placements or
video clip. When users elect to click on these ads, their entire
network of friends will be automatically alerted and then given the
chance to interact with that particular marketer's group."
Something tells me that if Facebook users didn't like it when others were notified when they left a note on someone's wall or added a friend, they're not going to like it when everyone can tell they clicked on an ad for Bad Credit, Victoria's Secret, or GMHC. This just sounds really... weird.