Depends. Does logging on facebook once a month to see what the few family members are doing counts ? That at best, I went months never visting it and just used FB as a SSO provider for any site I didn't cared enough to create any proper account on.

As for others, I only visit twitter if it is a source for update of something I care about, and that's near always coming from some other site like HN

Both could disappear tomorrow and nothing of value would be lost.

I tried some FB groups related to hobbies but they're generally garbage with no way to bury useless/low effort content.