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It's either going to be supplanted, or it won't be. There is no third option. You're welcome.

You seem confused. No one implied that there was a third option.

False. Facebook could retain all the Boomers, but coexist for awhile with other social media dominating the millennial market.

I wonder why this is downvoted... MySpace and Facebook coexisted in a very similar dynamic for several years before Facebook opened to everyone.