Ask HN: Should I continue being a social media luddite?

I don't have a facebook or linkedin account because I think these products enable (a) personal time suck, (b) bad kinds of behavioral experimentation, (c) the end of privacy, (d) 'social credit' systems.

But with the exception of (a) and possibly (c), none of these harm me directly. Now that these products are ubiquitous, I seem to be giving up substantial benefit by not using them.

Can anyone offer an argument against giving in and signing up?