Social life? What's that?
Due to various factors - my health, my interests, and my personal preference - I'm a complete recluse. I don't socialise at all, I've lost all contact with everyone I knew in real life - and I don't mourn that at all - and I don't really have any IRL friends to speak of. I've never been big on socialising, even when I was younger; people had to practically force me to socialise once I started Secondary School. It started out as a perceived necessity (I didn't really want people finding out about my health problems, and it was easier to just avoid them than it was risk having them pick up on it) before I just started preferring my own company.
That said, I do keep in touch with one person I've known since Primary School. We were in the same class at school, and we studied the same courses at College and University (at least before he dropped out and I started to see less of him) so we've known one another for quite a long time. I haven't seen him for nearly three years now, although we still talk fairly regularly (read: once or twice a month) online. We have similar interests, and like me he's a recluse, so it suits both of us to keep our contact limited to this even though it'd only take us half an hour, if that, to visit one another. I'd count him more as an online acquaintance now than an IRL one.