About the Expo Forums community
Expo Forums is a Discourse Forum for Mobile Developers with roughly 22K members. It uses a forum format for communication.
In their own words
Talk with other developers, get help, and share what you're working on!
iOS Developers(1)A Slack community for iOS developers with 30,000 members (and counting!) We care about three things: being open, helping each other, and sharing knowledge. If this sounds like you then request an invite. We look forward to getting to know you.
Mobile Product ManagementThis group is meant from individuals and domain experts in field of Mobile Product Management to interact, collaborate, connect & succeed.
Android UnitedAndroid United is a friendly Slack community of Android developers.
XDAXDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality.