Enrique: trust me. . facebook still would be king of social networks. . .lol. . just take an example of google buzz. . .total failure. . .
I agree Google Buzz was a failure, but no u r mixing two separate things. Buzz was not meant to be a full fledged social networking site, infact it was more like twitter, and yes Buzz failed to take over the real Twitter, which had its own reasons i dont wanna discuss about here.
Regarding Google Plus, trust me the hype it has created lately even before its launch is enough to take more 50% share of fb within a month. With fb's crappy updates it is anyway loosing market.