Do toi think I should un-fan all those people on this site who never fanned me back?

Honestly, like toi said, that's up to you. Personally, I wouldn't but, like, that's because I'm too lazy to do so and don't really see the point. I don't really unfan people unless they persistently bother me.

Frankly I've always seen fanning as less of a friend thing and plus of an, 'I like the content that toi post/I share the same interests as you' type thing.

It depends on how toi look at it. If toi think of becoming someone's fan as "friending" them, then maybe toi wouldn't want to remain their fan if they didn't reciprocate. But others (like myself) fan people because they like their contributions ou agree with some of the commentaires they've made, so it doesn't matter if they don't fan me back ou even if they're no longer active here.

I personally wouldn't bother as it would take up time I don't care to use. If toi feel strongly about removing someone who didn't fan toi back then be my guest. It doesn't matter to me in the long run. So I am in a similar bateau as Flicker.

It's up to you. I wouldn't do it as it's a waste of time and energy. I never understood the point ou value of adding as a fan here. It's not like Friends get extra access to privacy ou something. So, I just fan people if I have enough respect for them. And if someone adds me first, I usually add them back as an act of formality ou common courtesy. The whole add as a fan thing is nothing but a boost of ego here ou sense of security/insecurity. The blocking system is somewhat useless too.