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They're nested in the overflow menu, along with Help and Feedback, and there aren't many.
Of the two communication apps that Google announced at I/O, Duo surely seemed like the less interesting one.
All you need to contact someone on Duo is their phone number, which more often than not you already have for all the people you might want to video call.
Part of what made Whats App so popular as a messaging client, and then again as a Vo IP alternative, was the low-entry barrier (plus free price and multiplatform support).
If I dare say it, it's the millennial's () approach to video calls.
Once that foundation is built and trust is gained with users, I'm sure Duo will start adding more traditional options and filling the gaps for a more demanding user base.