On January 12, 2017, the founders announced that the platform App.net would be shut down on March 15, 2017.[13] However, due to a significant number of user data export failures that deadline was extended until March 16, 2017. App.net finally ceased to operate as a social network at 2017-03-17-06:45UTC. The source code for App.net was made available on their Github Page.
https://en.wikipedia.org/wiki/App.net