After 11 years, Tumblr’s founder and public face David Karp announced his resignation from the company in a staff email this afternoon.

Tumblr just fessed up to a frankly embarrassing security flaw that exposed millions of users' passwords. Actually, "embarrassing" might be an understatement in the broader spectrum of screw ups a company like Tumblr could make. "Astonishingly stupid" works, too.