This one may surprise you. You'd think that posting something more than once would only aggravate your followers. But if you're an avid tweeter, then chances are, your followers may not be reading each and every tweet you send out -- especially if you've disobeyed tip number nine and posted outside of peak hours. Repeat your best and most informative tweets several times during the day and see if you get an increase in followers. Who is reading your posts at the time can make all the difference in the world. Let's say you posted about a cool new iPhone application, and nobody said much. Twitter it again eight hours later and your luck may change. Don't overuse this method though. You don't want to become known for posting nothing but repeat messages.