I don't think you can make this claim without understand the motivation or threat models of the billions of non-facebook users. I use Google services, I do not use Facebook services. Am I the exception to the rule? How many are in this exception group?
How large do you really think the number of non Facebook adults are in the US that would be Google users? The number of people in the US on Facebook and the number of adults in the US is public knowledge. Just step out of the geek bubble.
I'm not following your logic? Are you saying I should join FB because everyone else is? Everything in life is ephemeral. Trends and apps come and go. This too shall pass.
My goal is to get people to question the relevance, time drain and impact to humanity that FB imposes on the world. I believe that if people did the calculus they would see the horror for what it is.
No. I’m saying a social network is worthless that people aren’t on. Whether you are on it are not doesn’t matter. Nor does a few anecdotes on HN when the numbers show something different.