Personally I think the concern is a little overblown

I’m around the university aged crowd, and a good number of people have minimal social media. For a lot of people, especially those that aren’t in business / CS, it might be hard to find them online unless they have a unique name or they have a close up photo as their profile (and you know what they look like).

So yes it does likely make things harder in some cases (meeting online), but I don’t think it’s that bad overall. This might be specific to my location, and maybe the culture is different in other big cities

Also it’s possible to have a presence without social media