2016 — Tumblr: Tumblr claimed it just found out about a 2013 data… 2016 65.0M records affected Share on X Technical writeup May 2016. Tumblr claimed it just found out about a 2013 data breach, which independent researchers claim affected 65m users. Root cause Hacked Referenceshttps://motherboard.vice.com/read/hackers-stole-68-million-passwords-from-tumblr-new-analysis-reveals