I've used Tumblr for 5 or 6 months and I already want to delete my account.
The Tumblr staff consists of some of the most lazy, selfish hypocrites on the planet. A few months ago my account was terminated for no given reason whatsoever. I sent Tumblr support multiple messages asking why my account was terminated and they didn't respond to any of them.
The Tumblr staff also allows white supremacists on their platform whereas members of the LGBT community are flagged and/or banned. It's sickening.
TL; DR The Tumblr staff is incompetent and lazy.