I have personally found tumblr to be rather cringeworthy when it comes to mental illness.

Sure, some posts are fine, but among those posts are MANY posts in which young teenagers are self-diagnosing as BPD without ever having been given a professional evaluation because they think it's cool.

They like having the label and like being unique because of it instead of getting the help they need to recover (even though most of these kids likely don't have BPD and are simply experiencing emotional growing pains).

They use hashtags such as #actually borderline on their posts, sometimes announcing "do not reblog this if you do not have BPD" even though they themselves are self-diagnosing.

I have seen many self-diagnosers try to put down the people who are truly diagnosed with this illness because they were told to stop self-diagnosing and seek actual help.

That's my experience with BPD on tumblr but I'm glad if you haven't seen this side of it because it's disturbing!