OK. So I have been searching the web for almost a week now off and on.
Here is what happened.
I have the facebook app for blackberry (i have the tour).
I received a friend invite and accepted via my blackberry.
I went into their profile and WHAM - i see a whole ton of very inappropriate groups that the person had joined - like a list of twenty.
I immediately posted a message to their wall asking if their account had been hacked.
THEN....
I checked facebook via my normal IE browser. Nothing there about these groups. It wasn't on their wall. it wasn't in their profile. I was staring at my blackberry and it showed the entries in their profile at the same time i was looking on my PC.
Soooooooo,...... they then replied - 'no, my account doesn't seem to be hacked, why would you ask that?'. oooops.
I did. This is freaking me out. I literally have pictures of my blackberry showing these group joins on his profile. hahah. i should just let it go. i am in it security though so it bugs the crap out of me.