[scopendo]

Maybe - though my guess is that they'll join a university population and/or workforce and start interacting with the wider world, that just happens to be significantly on Facebook. But at 40 mine is hardly a relevant opinion :)

[amplification]

My guess is they'll join university & the workforce, and then they'll join the world's most popular social network: email. ;)

[judk]

They don't. 20somethings don't use SMTP-backed email as a significant component of telecommunication.

They use websites, apps, and txting.

[GeneralMayhem]

As a 20-something, email still has an important place for official communication. Email is to texting/Facebook message what dead-tree letters are to email.