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Hard to say. I think many people on HN would prefer an on-screen keyboard, but that's sampling power users. Then again, it may be that the power users are the ones that are willing to take a stand.

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I would prefer google voice style, my phone rings and I am connected. I don't often take phone calls through my computer, despite using skype chat and having a webcam. I suspect many others are the same.

Which makes me wonder what percentage of internet users have ever had a google hangout?

Yes, but would those people also be the people who would have called in already? It's a tricky question (:

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