Cabana is Tumblr’s new app for hanging out and watching stuff. Video chat with up to five of your friends while watching YouTube videos together. Anytime, anywhere. It’s just you and people you like, so you’re already camera-ready.

— HANG OUT: Video chat with up to five of your friends.
— WATCH STUFF: Watch YouTube videos together while you chat.

More to come as Cabana grows. <3 Tumblr
From version Cabana - Hang Out, Watch Stuff 9.11:
Mr. and Mrs. Crab came back. We've issued a restraining order. We wish them and their new eggs all the best.
All versions