Is it true that there is now a rate limit on number of unfollows per day? One of my users said that your support rep is telling them they risk suspension if they go over 500 unfollows a day. Might be worth an announcement if that is the case so we can share that with our users...
If I can suggest against this, or perhaps another solution (or an exception for certain cases), one of the services I offer is the ability to remove all of your friends at once. This is something Loic Lemeur and others have done, and I think some times some people just want to start over. With a 500/day limit it may be near impossible for some people to remove all their friends at once. A better solution to kill spam, as I mentioned before, is to remove the follow limits and ratios on people that are already following an individual before that individual follows them, and increase the limits (I think 200 per day would be fine) for people trying to follow those that aren't already following them. I would leave out the unfollow limits due to the reasons specified, and they would be unnecessary with the limit rules I mentioned. Jesse