The thing is it was over a page of pictures at one point...in a story thread. Story threads and talk threads are two different things. One post on a talk thread...well, there's nothing to bitch at. People do it all the time. A dozen reposts in a story thread? That's not cool. It would be no different that Person B posting in Person A's story when Person A intended to do the story alone. Person A has the right at that point to shout "What the fuck?" and kick the shit out of Person B.
I'll be the man here (heh) and say I overreacted on the talk threads. I went on a little 'deleted this post' craze there. But I stand by my choice to deleted every fucking interruption in the story threads.
