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
TempMail.altmails - Disposable temporary email addresses
Tsu - Social that pays
Harakirimail - Harakirimail is a free disposable email service. Just send email to anythingyouwant@harakirimail.