It's filled with emoji and other "in" jokes that might not make sense to the olds.
There's a "ghosting" mode, which lets you sign in without notifying your friends, allowing you to stealthily choose who you want to talk to.
Twenty million may sound like a drop in the bucket compared to Facebook's billions or even Snapchat's 173 million users.
But the video chat app, created by the same team who founded the once-hyped live streaming app Meerkat, is beating its bigger rivals in one important way: engagement.
, is located next to the "Message" option on Facebook Timeline's layout.
Both companies attribute this success to their ability to connect their users with their "real" friends so they can be their "authentic" selves.
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