Katherine Hannaford writes... Love it or loathe it, Facebook is the new MySpace...oh, and the new Twitter, the new Flickr and pretty much every other work-shirker time-waster known to man, thanks to opening themselves up to third-party developers. But how much is too much? Is there such a thing as being too involved in the social-networking service? And just how many friends is acceptable - is there a stigma attached to Facebook in the same manner as with MySpace, where those with fewer than 10 friends are deemed social pariahs? Just how much is too much?