Twitter is shutting down autofollow
The email, sent by Twitter boss Biz Stone to all of the autofollow-enabled users, said that "We're going to discontinue autofollow because this behavior sends the wrong message. Namely, it is unlikely that anyone can actually read tweets from thousands of accounts which makes this activity disingenuous." I think Biz is right on the money with this one. If you care enough to follow someone, you should care enough to do it by hand. His message also says that Twitter will work with developers of apps that require mutual following to work, which is a good move on Twitter's part.