See, people still have an outdated opinion about this. There's no privacy nor seriousness involved if you make a fake account with a throwaway email. It's just like another forum account.
And I don't even buy the privacy concerns. I know very well about the motivations. >>416
Yea the popularity is waning but facebook hasn't been used as a traditional social network by young people for a long time now. I mean look at how facebook was used back then:
People made a thorough personal profile, uploaded lots of pictures of themselves and then posted every hour about what they're doing.
You have one or two meme avatars and a meme name and do nothing but share posts from memepages and shitpost in groups.
Only boomers still use it the original way.
The actual social media bit now happens on Instagram and snapchat where people still blog about their oh so interesting lives. But even there there's some unique cultures that don't use these sites for thier intended purposes and quickly subcultures form.