Social media presence as in having accounts in your name with you being visible in the profile picture in mainstream sites (Anything Meta, Twitter, Snapchat, Tiktok…). I don’t consider anynounmous accounts on Lemmy, Reddit, Kbin relevant to the scope of this question.
One anecdotal chime in: I dropped the Zuck for a year and gradually realised that my city runs all its cultural events through Facebook - unless you know or someone invites you, that was pretty much it.
I think I did miss out on meeting new people or seeing old friends by chance, simply because I didn’t know to turn up somewhere for a gig or whatever - and the old addage has some truth imo; often you just need to be in the right place at the right time for things to happen.
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I’ve experienced the same thing. Facebook Marketplace has also largely displaced Craigslist in my area. Though on the whole I’m still glad I deleted my Facebook account.
I host some decent sized gatherings for my extended friend group (20-50 people). The invites are all on Facebook.