From what I read that's not a good thing to do is just push your own stuff and not comment to others. You have to have a good balance. One person I find that is good about this is a guy from Appleton named Tommytrc. I don't know if he ever leaves Twitter, but he posts a number of links and jokes around with others. Then there's this other guy who only posts his motivational stuff or whatever it is he's pushing and ignores everyone. It's all about him. Good thing he doesn't post often.
Wait, didn't you say in the DM when you added me that you looked forward to reading my tweets? Now you're busted!