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Realistically, though, is this going to:

- decrease Twitter usage, or

- increase Twitter signups

They apparently have calculated that they have enough mass that people will be dragged towards the latter.

Realistically, though, is this going to decrease Twitter usage.

I would never hand my phone number over to Twitter. Would you?

I wouldn't, but almost everyone I know would.

I guess it worked for Instagram so they're copying them?