Do you like to be ignored? Probably not, the same concept applies on Twitter. When people follow you, follow them back. Now I don’t necessarily mean everyone because there are spammers out there on Twitter and it’s very likely you do not want their information showing up in your Twitter stream. Develop your own criteria for who you will follow back. Two of the biggest reasons I will unfollow someone are vulgar language and tweets too much. When I see someone who has 3,021 followers but has tweeted 12,358 times you can be assured I will unfollow or not even follow in the first place. As you spend time looking through your own Twitter stream you will develop your own reasons for unfollowing people.