Well I don't care for either one but I dislike Yahoo more than facebook so I'd say this is a good thing.
I've disliked Yahoo every since they decided the best way to be a good website was to have excessive spam and crap all over the page. Once I discovered Google and saw how clean and simple it was that was it I was done with the loud annoy neon flashing lites screeming look at me on the yahoo page.
Facebook will be canned. It will take either alot of stuidity, loss of scratch on Marks part, or the complete and utter reality that comes to people realizing that there is more to life than a binary profile over the International Network.
Facebook, nothing but a huge time waster!
Whereever you go people are frantically updating their page or writing on someone's wall or whatever; as if anyone would actually care. Go out into the sunshine and actually 'meet' people. Try to socialize in the real worlk instead of on a dumb computer screen. Facebook is to socializing interaction what masturbation is to love..