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? ?I seem to recall that in Yahoo groups the invitations expired after some amount of time (30 days?).? Do invitations for Groups.io groups expire after a particular amount of time or are they good until canceled?? I suspect that most invitations that aren't responded to within a day or so can be assumed to be either lost or deleted, but I have had people respond to an invitation as long as 28 days after it was sent.

? ?Do you resend invitations after they haven't be responded to for a certain amount of time?? If so what time period do you think is appropriate?? It seems that if there is no response after a few attempts you should just forget about that person.? How many tries do you make before giving up?

Jonathan