Thing is, when facebook isn't the primary platform this doesn't have to be an O(n^2) problem. Throwing everyone in a group, whether it be on Hangouts or Signal

Thing is, when facebook isn't the primary platform this doesn't have to be an O(n^2) problem. Throwing everyone in a group, whether it be on Hangouts or Signal isn't terribly hard, nor is sending out an email invite if you'd prefer that vector.