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I would definitely pay to use twitter although I do not think that would be a good idea for them

You say that, but when the userbase dropped by, oh, ~99%, would it still be so useful to you?

I believe the scenario was whether we'd pay to use them as they are now, not to extrapolate how they'd be after and whether we'd use them then.

Well .. the two are inseparable in my mind, but fair enough.