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.
In my experience, massive impact.
I refuse use Facebook and WhatsApp, and yet >95% of this country’s population rely on those things.
It means that practically all of my potential social circle excludes me. Most people don’t care about reasons to not use those things - “after all, everyone is there and I have nothing to hide.”
Most people hardly even know that their phones can send plain sms messages for free, to say nothing of email. If asked to do so, most honestly don’t know how!
Refusing to use Zuckware is costing me a lot of social opportunities.