erlend, en @photomatt & co have talked about making Tumblr fully open source for a long time. In light of Tumblr’s downsizing, this is the time to do so!
Since it’s failing to make a profit they may as well release it for the wider internet community to go nuts with it.
Better yet, spin Tumblr out as a standalone co-op venture to succeed or fail on its own merits.
https://www.tumblr.com/photomatt/733551497286172672/translation-of-internalspeak-to-externalspeak