1. One of the best ways to do this is to give interesting updates on your daily life, comments on current affairs that people are interested in and/or giving your opinion on items that you may wish to sell. Ask them about their interests or what they would like to see you tweeting them about or even better what products they would like from you. This will lead to retweets depending on how good your tweets are leading to a viral effect of follower magnetism!
2. Another good thing you can do to keep your followers, get new followers, and get RT's (retweets from your followers to their followers) as well as getting recommended as a great tweeter, is to make your followers laugh (or at a minimum smile!). I go out of my way to ensure that I am making my followers laugh so that I can help brighten up their day in some little way if nothing else. The comments you receive back alone make this extremely worthwhile and fulfilling. It may sound silly, but telling a joke at a bar might get two or three people laughing, tell a joke on twitter, and in my case you will have hundreds of thousands people laughing between your own accounts and the amazing viral effect of retweets. Jokes of your own are best, but if you ain't a comedian, there are innumerable sources of jokes and funny quotes also available on the web.
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