Wouldn't know, I don't use them! Although there is one that's completely overbearing in every sense of the word. It isn't used though bar a select few who choose to say things in their special secret sections. Kind of like when you're in primary school and you create those clubs that only certain people are allowed to, and you say mean things behind their backs. Yeah, like that. Like the slow, 5-year old version of the film Mean Girls, only nowhere near as pretty.
You didn't see 'Mean Girls the directors cut' where there was an extra one who they nicknamed the Tasmanian Devil, not because she was feisty and from Aus....but because she used to spit randomly and her mutterings were impossible to understand