You can also send out your tweets. If people like your tweets, they will begin to “retweet” them to their own followers, some of whom will choose to follow you, too. In a very short time, you can build up an amazing network of people involved in your area. A tweet I did last week was retweeted by four people (there is software that helps you track your retweets). The total number of followers came to more than 5,000. So my one tweet went out to more than 5,000 people around the world, most of them interested in the same area as me.