Several years ago I asked a similar question here and my answer then was unequivocal: I said my online friends matter just as much as my offline ones. However, having since been used and thrown away by one online "friend", kicked in the teeth by another and flicked without any semblance of a reason by a third, my answer now is...rather different. There are still a few who remain exceptions to the new feeling of extreme wariness, but it'll never be the same again.
Online and offline acquaintances, at this stage, I think of (as) just the same. Hopefully experience won't teach me otherwise in those cases as well.
Unfortunatly offline friends can hurt you just as easily as online friends.