Have you ever unfriended somebody here?

Yes...Benedict Arnolds.

I don't think so.  But I have chosen not to be friends with a couple of people who asked. 

I don't think so... I may have forgotten but I rarely unfriend anyone ever. 

Only once.  It was about two minutes after I accepted the request.  The person sent me a message right after I accepted and I immediately knew I wanted nothing to do with them, and eventually she and her ilk left here.  

I consider myself to be an endangered species who would be afraid if he had any friends here. But to answer the question, no, I haven't unfriended anyone.

not yet, i dont do that unless i have a good reason to do it