Well, I am super social, but usually it's pretty clear if I have anything in common with people, so I tend to pursue those friendships. I rarely turn down social invitations unless I clearly don't like the people or I get a weird vibe. DH and I have gone out pretty much every Saturday night of our 33 year marriage, usually with others. We have more stay home weekends now, where we might ride with friends, but chill the rest of the weekend.
One thing I've learned, is that while cycling might be an initial thing I have in common with others, it doesn't mean I would really want to be close friends .