Twitter and its Bitly URL shortener are a joke. We've created 1,677,769 phony clicks (for the purpose of our legit Twitter: The Dark Side Case Study and for that purpose we've used 20 accounts, from the same IP, bombarding Bitly quite a lot
After a few months working on that study MHO is that they do not give a flying frigg about anything i.e. legit analytics or putting all those bots that are swarming there in order.