EponineAmneris, I think a lot of people on the Robbie Hart board posted pictures saying they didn't care if anyone took them.
The only thing you should be aware of is that LynchMob is a professional photographer and asks that people get her permission before using her photos. She's also the moderator of that board.
So just about everything should be fair game, but if you want to take any photos posted by LynchMob on the Robbie Hart board or any of her photos from lynch-mob.net, you should ask first. It's not that big of a deal to just ask and she doesn't bite either, I swear.
Avatar credit goes to _shiksagoddess_ on livejournal.com.