One of the many things that makes Tumblr a very notable space is the way the microblogging site fosters communities. Through the use of tags and reblogs, communities are built usually upon a similar mindset, manifesting themselves into very secluded and secure spaces for users. Through this, subversion of cultural paradigms can be nurtured on such an open format as the Internet.
Some of these communities verge on social unacceptability, like pro-eating disorder Tumblrs (often referred to as pro-anna or pro-mia), that post photos of thinspiration – motivating pictures of very thin people that they would like to emulate. As toxic and unhealthy as the thinspo sites are, there are other Tumblrs that flirt with unacceptability in a very different way, notably the fat fashion blogs.