Palaround - Meet people you should be friends with.
Simple Poll - The easiest way to create polls in Slack
Digg - Digg delivers the most interesting and talked-about stories on the Web right now.
GitHub Polls - Polls for GitHub issues and readme
quippd - quippd is a social news site that anyone can edit.
Curious Polls - Answer a question once a day for the chance to win £100/$100