@Ginfordinner
It's difficult isn't it? For a child who isn't majorly into socialising, nor has an interest that brings them out, often feels that everyone else is rushing round going out all the time and they're not welcome. Fact is not all students are rushing out to the pub on Friday/Saturday night-but the vocal ones often are, and the silence in halls "confirms" that they're the "only one left".
I don't know how that can be helped.
But I think technology/social media does help and hinder.
Help in that they can message friends from home, so don't feel alone.
Hinder in that they can message friends at home and so don't feel the need to make friends at the beginning. But those friends move on, plus are only virtual friends during term time, so the person can get more and more isolated.
I remember a friend talking about how her son hadn't really made friends at college, wasn't really interested in doing things there. I asked if he was doing any societies, and she said. "Oh, he doesn't want to do things in the evenings, because some of his home friends work, so the only time they can message is the evenings, and he doesn't want to miss that."
He didn't feel the need to make friends at college at first, because he still had the friends at home.
Problem came when he realised that he did want friends at college and found that they'd all made friends, and did things together, and it was much harder to break into these groups that start at the beginning.
When I was at college and the only thing we really had was snail mail for home friends, people were much more forced into joining in.
Maybe unis could look to doing something along the lines of online groups called something like "I don't want to go out on Friday Evening"
with the idea being that anyone in can chat on those, and maybe a couple of meet ups a term. That way they could at least see that they're not alone, and perhaps meet like-minded people.