Stringify friend's email and notification features are in the release version of Android. One way to add a Stringify friend, go to Discover -> Things -> Friends -> then tap connect. Enter your friends email address and they will get an invitation to join Stringify and except your friend request. From there you guys can manage permissions.
In the near future, will also allow you to access your friend's location for flows like "when my spouse and I are both away from home.... lock the door and turn off the lights".
There is an anything specific we are testing in beta at the moment. So the latest Google Play Stringify
App is the one to use.