In 2012, changes made to Twitter’s spam account identification algorithm have been catching and suspending some new Twitter spam accounts more rapidly—sometimes much more rapidly—than in 2011.
More users than ever before are reporting that as fast as they can check new accounts that appear to be spam they have already been suspended. This sometimes creates confusion, as Twitter does not always report “Account Suspended” but sometimes “Account Does Not Exist,” leading to the question “If they don’t exist, how did they follow and tweet me?”
Despite the occasional confusion, this is a great achievement, as Twitter is working to put in a place a system that stops spam in realtime as it happens. Eventually, Twitter’s goal is to predict spam before it happens.