I'm part of the irresponsible, young generation that's big into social networking... And I man up and appologize in real life.
I've done some dumb crap. Not a whole lot, but some. I've actually texted quite some dumb stuff, but I made my appology in real life. Not in another text afterwards.
How about looking at this like a positive? Maybe it shows character. If someone's not man enough (or woman enough) to come over and say sorry to your face, maybe that's more an indication of his/her character and not so much of something you can just blame on this generation and social networking sites.
I've found the positives to far outweigh the negatives. Opening up and starting something is easier. You might call that taking the easy way, but why not use that extra tool?
Or taking it even further... A forum is a social network in itsself. I don't know how all of you feel about me, but I do know that I feel... "close" in a certain way to a lot of people here. And I'm close to a 100% sure that I wouldn't have met any single one of you, had it not been for social networking.