to gather 1500 follower taken 3 months. i love twitter.. because it gives you a news with in minute after happening.
have about 1500 followers, I try to follow about 20 to 30 new people every few days and about half of them will follow back
It's not easy to get lots of followers on Twitter at first because people usually follows an account that have gained several followers already. So the first thing to do is to increase the numbers of followers by mass following and unfollow those who don't follow back. This way, you'll earn good reputation and be followed by people without asking them to.