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@silverpill

I missed this one!

- Groups. A good one! `Join`, `Leave`, `Invite`, `Accept`, `Reject` activities all help. We need to revive the `members` collection, which I think helps a lot towards getting private groups.

One you didn't mention was addressable contact lists -- like Circles from Google+ or Aspects from Diaspora*. A really helpful way to segment your followers and share some things with family, others with colleagues from work, and others with your friends who like trains.