How do i send facebook a complaint?

[Sasha]

For the past month or more there has been adds on the side of Facebook that say "Hot Russian girls want to chat with you" there would also be a picture included of a butt or clevadge. It never really bothered me that much until today, actually about 5 min ago, when i saw an add that said " Russian girl want to fu** click here to fu** with Rrussian girls. ok so big deal...untill i saw the picture. it was pretty much porn. it was a naked girl and i could see her boobs and vagina. That's it. im not putting up with this any more and i want to send a complaint to facebook. Im afriad my mom will walk in and think I'm watching porn! HELP!

(ALSO: if you have seen these adds, say so!! i want to know how many people get them)