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It's pretty easy. Log on to twitter, then use the statuspeople web app to see if your followers are fake or real. I had about 10% bots/spam followers. It allows you to check other twitter users percentage of fakes as well, so you can end up wasting time looking up other people too. Just for fun, I checked @mittromney and saw 22% "fake", 31% "inactive" and 47% "good", so you can see how you compare.