Just as people uses neckbeard to refer to overweight and misogynistic male, the term legbeard has started to gain traction to refer to your average "Tumblrite SJW". There's even a subreddit about it and seems to have some spread on 4chan.
The thing is, I have doubts about how big is it. Should it have its own entry or be included as header on the neckbeard entry?