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.
Depends on a person and their social circle. I hardly have any social life apart from the on-line interactions and infrequent in-person meetings with on-line friends. And it is not like I stopped having friends when the internet appeared, on the contrary.
Social media getting shittier and shittier directly affects my social life. I hope something good for this purpose appears soon and at least some of my friends and acquaintances move there, like they moved to Facebook years ago.