The Twitter community has a very positive feel to it. This is in part because unfollowing other users is easy, and unless the people being unfollowed have special tools in place, they’ll never know.

But sometimes, simply unfollowing someone is just not enough. That’s why there’s now Gunfollow.com, the Twitter hitman. You can “hire” Gunfollow to unfollow and block a user. It’ll be quick an painless, and you can choose a message that gets delivered to the “victim”. If you prefer, this message can be delivered anonymously.
More Introducing Gunfollow, the Twitter hitman