Lol, I'm baffled some people really think watching porn is normal but watching (half) dressed women on social facebooking sites is freaky ...
Watching porn has simply been accepted into out cultures since we're now finally admitting we're all doing it, and in some time scouring Facebook for hot babes will be too. It's not like girls put their sexy posed bikini pics on there by accident, they want the attention, they want confirmation they're hot. And maybe the'll learn a thing or too when they get stalked by freaky weirdo's that want to meet up and have some "java".
As for me, I've always liked suggestive clothing better than porn. Porn is so obviously fake and made, plus it leaves nothing to the imagination. I like to fantasize about that girl next door, trying to find some hidden message in her "Hey" and "Bye's". Seeing her undressed would be nice for a second, but it would ruin everything in the long haul because there's nothing left to imagine.
That said, I don't supplement porn with Facebook since I'm not on social networking sites (besides Hyves), but you bet I'll click a cute girl anytime