But I do agree, if Google had invested in FB they would have probably not pushed for OpenSocial so aggressively and so quickly. But I think they would have eventually done it, meaning they would not have been stopped by FB.

I think there is a lot more to get out of OpenSocial. If they can reach out to the whole web instead of one network they can probably do a lot more and target a lot more people. As they said it themselves, they look at the web as a platform instead of one site on it as the only platform.

So far with OpenSocial they have Myspace, Bebo, Orkut, Friendster, SixApart and +++ which is almost = to the web. This is not a bad deal compared to one site that is mostly about what it could be in the future rather than what it is actually right now (which is not much compared to Myspace, and definitely nothing close to all these sites combined.)