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Please stop doing that. It's bad for the world.
Instead of manually finding interesting people on my niche, I set my criteria and let my program do the dirty work for me. What's wrong with it? I don't even spam people. I send one link to my site per every 5 witty and inspirational quotes. A few people that I met over there have contributed to my site as guest bloggers. I am not doing anything evil - just automating something that I would hate to do manually.
Spammers like you end up making people judge Twitter as "more spam" and giving it up before they've really tried it properly.
Your followers are probably more likely than normal users to give up Twitter because it's just pointless noise.
Simple utilitarian argument against what you're doing: if 10% of the Twitter population did what you do, Twitter would become mostly useless.
I really hope they write scripts to detect and ban you.