In my terms of service (and just about every forum TOS I ever saw) the simple act of posting anything on your forum be it text or picture grants you an irrevocable lifetime license to do with the content as you please. If the user owns the copyright they grant you a license to display it forever. The issue arises when a user posts an image they don't own the copyright to... in that case what is supposed to happen is the copyright holder sends you a take down notice you must comply with or face a lawsuit in which case you should comply.
However there is one well known company skipping the take down notice and going right to the lawsuits so it is a tough call.
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