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It's the chat app that's taken the world by storm, the software that's replacing email and IM and everything between. It's supposed to be just for business teams, but its free tier has become the new popular way to form an online community.
Slack wasn't the first team chat app, nor will it be the last—if anything, its popularity has plenty of other apps adding chat features to their latest versions. But as a chat software built by the team that designed Flickr and then set out to build a game business, Slack is business collaboration software that feels fun.