A photographer having to go to court to defend his ownership of photos they'd exhibited through twitpic and get paid by newspapers who claimed the ToS said he'd released his rights, demonstrates this is not a "please not again" problem, this is ongoing, big corps are misusing these at the expense of individual artists, and the problem's getting worse.
Every day I talk to artists who have no idea that posting their latest music video to a video sharing site could give that company performance rights in other media, or, as in this case, that pinning their own photos to Pinterest would let Pinterest publish a "Best Pins of 2012" book w/o compensating the artist.
This needs to be called out and both consumers and creators deserve to be informed.