Maybe I am too much of an "idea guy", but in my opinion the reason why there aren't many googles is simply because there aren't many good ideas around. I don't even consider social networking to be of any significant value (I'm with Maroon on this one). In that regard it was awkward to see Facebook and Google mentioned in the same sentence several times.
Even something as awesome as RSS isn't taking off (and it's been like 5 years already), let alone toys like Twitter that only a certain "inner circle" of people are using talking mostly to themselves. Not good enough.
Yes, yes - "implementation is more important", but without an idea there is nothing to implement to begin with. Most startups I know a little bit about seem more like an excuse for smart and driven people to work together: they aren't building anything particularly innovative. An no, they won't become next google regardless of what VCs or potential acquirers will do, it's a very rare case where I don't agree with Paul at all.