Tumblr is a disease.
For example: People love to self-diagnose
If someone’s shy, but doesn’t necessarily have social anxiety; and he gets a tumblr, soon enough he’ll see a post describing social anxiety. He’ll relate to one or two points, and soon enough, he’ll be convinced that he has social anxiety. Soon enough, his mind will also be convinced, and he will develop a real social anxiety.
I’m not saying that some people don’t have it from the start, but self-diagnosis causes things such as that to grow exponentially.