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I'll take that invite and raise you a beer...

I have no invite to Google+ and even if I did there is a note on the home page "Have an invite? Sorry - we're temporarily over capacity". Not sure if that's a message only for users outside the USA...

Both Google and Bing have acknowledged they look at social signals as part of their algorithms.

Yes - This is the part that intrigues me the most (no doubt due to my SEO roots).

Personally I was surprised how quickly Google+ took off. Google was kind of getting a "big brother' label with all their scandals related to mapping home wifi networks etc.. I kind of figured this...

I plan to use Google+ to ignore people...just for fun :D