While Instagram is busy ripping off Snapchat feature-for-feature, the original ephemeral messaging app has finally added something Instagram has had for years: group chat. SEE ALSO: This is getting ridiculous. Facebook just ripped off Snapchat's navigation. Snapchat's group chat is simply called "Groups" and it's pretty straightforward if you know your way around the app, but it does come with a few quirks, and some of its features may not be that obvious. How many people can join a Group?