I like friends to have at least 2 clubs in common.

^Same. Originally I wanted them to have at least one full line of shared clubs, but it also now depends on how much I like the shared fandoms and how much I've liked/agreed with stuff I've seen that member comment or contribute.

When I see that someone without shared clubs fans me - rare but it does happen - I often end up wondering "how have you even come across my profile?".

I only add nice people on this site. If I like somebody's comment, or some picture, or video, I'm a fan. @LowriLorenza89 Thanks for letting me know. You just lost a fan. I thought you were nice. I was wrong. My bad. Goodbye!

Next time I'll think twice, before adding the wrong people to my list of fans. I learned my lesson the hard way.

I don't need to have stuff in common with a person as long as they're nice. But because of past stuff I really only add people who I've had a few conversations with first so there's at least some level of trust. Plus I'm just rarely online anymore.