Part of me wants to see this come into fruition, and I think that's the same part of me that wants to look at car accidents on the side of the road as I drive by.
I mean, your comment jumps to the conclusion that a MS social network would be a failure, and yet Google has failed at "social" at least three times that we know of and still gets an immediate pass here.
sigh For what it's worth, I don't see why MS would want in on this space when they're probably better positioned to take advantage of the network effects of twitter, facebook and G+.