The only way that twitter will work is if you target the correct market and people. if people add or follow anyone and what to use this for business it will not work.
I have about 9,000+ followers, it doesn't help my biz that much yet, I guess I have to have a more larger number of followers before I can see some results.
I have 2,000 followers and lots of clicks but it hasn't done anything for me personally as far as I can tell.