Talkus - Chat with your website users from Slack
Hamster Pad - A social network built on top of Slack
Slacking Pigeons - Chat in real time with your users directly from Slack
Kaboom by Hotspot Shield - Share messages & photos that disappear on any social network
Chatlio - When you have a business to run, your average instant messaging software just will not do. You need an internal presence upon which your entire team can collaborate on. Read more about Chatlio.
Tsu - Social that pays