The language being posted as part of the TOS is pretty standard. I do contracts all the time, and we include things in there that probably could be tossed in a court of law (judges can toss anything... that's why there are appeals courts).
The bottom line is that in the digital age the technology is far outpacing the laws. Lawmakers don't know shit about digital things, and people are constantly pushing the boundaries. The owners can post whatever they like, and you, the user, are acknowledging their rights by clicking on that button. Will it hold up in court? Well, somebody is gonna have to see if they want proof.
As far as their getting to own copyright imagery uploaded...well, by taking the photo the photographer (often the person holding the smartphone) automatically owns a copyright to that image. If those images are uploaded illegally (say the girl's management for the sake of argument does it) then the girl in question had those images uploaded illegally, and the board would legally have to take them down if served with court paperwork.
But all of this is rather meaningless unless there IS court action. The courts have reasonably upheld that ISP's and their ilk are not responsible for the actions of their users. However ISP's also don't claim to take ownership of information.
So if this issue is really burning your butt, you have a couple of options - first don't post here. That will solve the issue. Or, upload copyrighted content and then find an attorney to bring suit against the board owners for illegal use of copyrighted material. Then sit back, write a bunch of checks to pay for the aforementioned lawyer, and wait and see what happens.
Or just say screw it, have a beer and go spend your court costs on a deserving lady.