For whatever reason Google have not invited me, but it will be very tough for them.
What they have failed to crack is how to leverage their vast user base through things like gmail.
Google could trash FB like it wasn't even there, but it won't.
I apologise for using the "E" word to a mainly American audience, but FB is the survivor of a vicious evolutionary process where many things were tried, and almost all failed.
FB provided what people wanted, when they wanted it. Sure Mr. Zuckerberg is smart but he was also lucky and there is a maxim that the price of gold represents the cost of all the gold mines that never made a dime.
FB is that gold.
The only thing that will beat FB is some crappy little startup in Estonia who simply by being part of the exhaustive combinatorial assault on the problem get lucky and rich.
google can't do that because it can't start 200 startups, and since 2,000 are probably not enough, it's not likely to win.