This thread is becoming a good list of people *not* to invite -- the instant-doubters, the hermits, the naysayers, the nattering nabobs of negativism. How quickly they jump in to say "impossible" or "I don't wanna."
Copy out the names of these folks and just don't invite them.
As for exchanging personal information on messages, it's not hard. Easy to do. Not an obstacle. Anyone who can spell a number or write the word geemail can figure it out.
Let see if you get a few from the positive camp and we can have a go.