sup3rS3cretMes5age - A safe, simple tool for one-time (self-destructing) messages
Hamster Pad - A social network built on top of Slack
Mailinator - Any Inbox. Any Time.
Kaboom by Hotspot Shield - Share messages & photos that disappear on any social network
10 Minute Mail - Temporary disposable e-mail service to beat spam. Avoid spam with a free secure e-mail address.
Tsu - Social that pays