[tripzilch]

Huh? "Preferred" doesn't cut both ways. It never does, unless it's a shared preference. Using any shared method of communication to contact each other is what real friends do.

Also a group that "just decides" outliers are not worth the hassle, are not friends. They seriously are not. Friend groups are pretty much defined as the sort of groups that do not do this. Except in cases of grave social misconduct, often destroying the "group" or "friend" aspect in the process.

They are a group, yes. And indeed, some groups will sometimes just decide to ostracise outliers if it conflicts with the group identity. Nothing inherently wrong with that, btw, this can be very useful for certain types of group. As long as it doesn't become the main type of group you identify with. Because then, as we see from all the people making excuses all over this thread, not adhering to certain rules of the group-identity becomes an existential fear of epic proportions, because it touches upon a very fundamental behavioural aspect of our biology--fear of being cast out of the tribe (which used to mean suffering followed by near-certain death).

Facebook is currently exploiting this behavioural trigger (together with an addictive cocktail of other triggers) in a quarter of the world's population.