I know you USED to be able to just go to your friends list and click an x in the corner to delete them, but now you seem to have to go to their individual page to delete them. it is kind of annoying, i personally deleted lots of people for the same reasons you are talking about, and it took a long time. if there is a faster method i don't know about it.
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I'm "kind of a big deal".
http://img.imgcake.com/cyclo/Cyclopngegpngre.png