This is about serious talk not jokes...
Are you saying what the Valve employee said was a joke or Nintendo having a real gaming network is a joke?
I think both are, to be honest. That Valve dude has a problem with his thinking if he believes that is the only way people connect. Conduit works well, plus people arrange to meet up in other places like forums and what-not.
Besides, Steam is a terrible social network for me because I always forget it is running and leave my computer so poor Kraken tries to chat with me and I don't know 'till I come back and see I missed him (

Sorry, Kraken)
Maybe it's because I'm old-fashioned and didn't grow up having networks like LIVE or Steam, but I see plenty of ways outside of those to communicate and connect with people to play with you.