[kyuudou]

Sure, but already FB is tainted with an "only old people use that" meme for several years now. Once the boomers start really dying off, I think this is when FB will fade.

Plus, I think society as a whole is beginning to see the toxic ills of social media in general and will push back in a "retro" "back to the basics" kind of movement, embracing old traditions like community, family and friends in meatspace.

[Alphaeus]

Facebook proper might be tainted with "only old people use it", but Instagram still has massive influence among younger people.

[dhimes]

They might fade when we boomers do, but they also could stay in that sweet spot of people who have disposable income and are apt to spend it— a sweet spot advertisers love. They could end up targeting 40-65 year olds perpetually.