It used to be that when you were followed by a spammer on Twitter, you had to go report them by sending a direct message to Twitter’s official spam account. Now they’ve updated their reporting system, so all it takes is a single click. Have fun turning in the bots!
And no, you can’t abuse the feature just to be a jerk:
No automated action will be taken as a result of reporting a user as spam (in other words, it can’t be used to incite an angry mob against an account you don’t like.) And once you report a profile it will automatically be blocked from following or replying to you.
“Help us nail spammers” [Twitter]