The thing I really hate most about tumblr (among many things), is just how easily misinformation can spread. SInce there’s no persistent comment chain or up/downvote system, shitty, wrong, and dangerous posts that are just worded really frantically can gain a shit-load of traction without being contradicted, and even THEN that will only matter if the person with the correct knowledge has a huge follower count anyway.
Just… really. Don’t believe ANYTHING you read on tumblr. If you read something interesting, try to confirm it with a five second google search, or just check snopes. It’s really important! Don’t be an accomplice in speading incorrect (or even malicious!) information.