In the last couple days, I've noticed my number of followers has increased from 70, to 72, to now 74. That's great!
In my settings, I have checked the box that says I want to be emailed when someone follows me. I have the correct address in my profile. Unfortunately, I seem to no longer be receiving these email updates. The last that I received was on Jan 12, but I know I've gotten new followers since then.
Like many other people, I'm seeing an increase in new followers who are following hundreds or thousands of people in a short amount of time in an attempt to get people to follow them back. When I navigate to the new follower's page, it's pretty clear that the person is a "Spitter" (Spam + Twitter = Spitter) by just looking at their Followers / Following numbers - e.g. Following 5,082 but only 43 Followers. I am going through this exercise about five times a day and it's really starting to take the joy out of Twitter.
Please consider changing the New Follower e-mail notification so that the the Followers / Following metrics are included in the e-mail. Even better, can you add the Follow and Block buttons into the e-mail? This doesn't solve the spam problem but it would go a long ways towards minimizing the impact. Thanks!