The problem with complaining about being imposed on via Twitter is that you can't be imposed on unless you invite them to bother you. While spammers, scammers and a-holes run rampant on Twitter right now they're only effective if you open the door and let them in. If you don't, your only inconvenience is a lot of fake followers which should only be of benefit to people looking to stroke their own egos with large follower numbers anyway.