Just to play devil's advocate for a moment -
I went dark on social media for a while. What I found was that I actually felt more isolated, as people didn't invite me out as much because I just wasn't on the list of people to click when they set up their facebook event. My good friends? We text and call and email each other. But the other social interactions, the sort where you might not know everyone and you might not be 100% comfortable, but it is a good chance to leave the apartment? All facebook.
Facebook also works on algorythms, so the more you post and the more you comment on things, the higher your posts show up in other people's feeds. Likewise, time of day matters - more people are on facebook 9-5 on Monday than are on a Sunday night. People may just not be seeing what you post.
But what has helped the social interaction stuff the most is using facebook to find local events I'll know people at (like art openings), because I can see the guest list, and then going. Because they are public events at set venues, there is no awkwardness of showing up at an event hosted by someone in their home. And then, once I'm there, I can "run into" people I know and have social interactions, often based on the work that is on the walls- which takes down the pressure to know what to say. But it is also incredibly easy to run away if I need to. It becomes a way to interact with people I don't know well enough to have coffee with, but know well enough that I can practice having a five minute conversation with. Just a thought.
Edited to add: the more I show up at these events, too, the easier it becomes. People are starting to recognize me. They are starting to want to talk to me. And sometimes, I end up getting included in activities like dinner or a drink after the event is over. AND, after a solid two years of forcing myself into these scenarios, I've actually had people start asking me if I'm going to be at events, because they say they want to see me.
I'm not trying to brag at success here, just share a story that might provide a glimmer of possibility. I never thought some years ago that I would be capable of connecting with people at all.