I saw that there's the same community on Twitter now which was also on Tumblr, which scares me as well, but luckily, Twitter is a tiny bit bigger, so I can avoid the tumblr stuff better.
And ye, I think it happened on there. The reason I got on Tumblr in the first place was because one of my best friends back then introduced me to it, and when I saw the self-ship community, it was a dream come true. Except that dream was a nightmare.