I have a slightly similar experience - I got off all social media, felt good but not life-changing. My guess is this is due to not being an extremely addicted user in the first place.
I don't consider those to be social media either.
I'd say that's what makes a site 'social media.'
A news site isn't social media necessarily, but the comment section pretty clearly is.
Yet many people have convinced themselves that no, twitter is the real world.