Pinterest, We Have a Problem
I think many are dismissing this as "standard TOS/EULA legalese" and missing the point. Let's consider a scenario: let's say you post some photos online, and license them under the CC-By-SA license (http://creativecommons.org/licenses/by-sa/3.0/). Then someone pins the photos you took to Pinterest. Next, Pinterest sells the photos you took, then catches someone copying or modifying the photos you took and sues them for copyright. To top it all off, Pinterest doesn't even give you attribution.This is exactly the sort of thing that CC and GPL were created to combat: ruining someone's life through the legal system based on abuse of the copyright system. You want to sue someone over copyright violations of information you have copyright on? Fine. You want to sell something licensed under CC-By-SA? Fine. But you better be ready to comply to the license and allow whoever you give those works to the right to copy, sell and modify those works. I highly doubt Pinterest is prepared for this, and their TOS is overreaching.