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.
I personally don’t have any except for a LinkedIn and I never feel like I’m missing out. People don’t care, I never ask to follow people. If I care, I’ll get their phone number.
But usually, I don’t care.