Using tweetadder is a great way to get your account suspended. Also, it's not about the quantity of followers you have, but the quality. People who follow back based on a keyword search are probably going to be pretty worthless... If all you want is a big number on your profile page you may as well just buy followers from Fiverr.
At first we thought they would be worthless too but they aren't. If you are diligent and specific on who you try and connect to, then you get quality followers as a result. We have gotten sales signups and made several business connections through this campaign.
Well if you have signups then I stand corrected, apologies for assuming you didn't.
I still can't get myself to embrace Twitter, but this was a good set of thoughts around it. Maybe someday I'll get it together, re-read decent articles like this, and get myself out there. In any case I appreciate the poster's point of view.
Couple of solid pointers on expanding a twitter base.