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.
This is niche, but in dating / not-quite-dating apps, it’s not terribly uncommon for people to want to see a social media profile, both as a way to get to know you more and to verify that you’re a real person.