I am referring to the total number of Twitter followers to date. I promised some of my 
readers to share my experience on Twitter with others if it reached 1,000.
1) Identify your target group and follow the key figures in that group. A special thank to my executive assistant/friend Gary for his research.
2) Start following other people, preferably within the same interest group. As a courtesy, I estimate around 15% of the people will follow you back.
3) Stay active – retweet or tweet regularly, at least daily. Discipline is required here.
4) There are a few psychological milestones in terms of number of followers. To me, they are 100, 500 and 1,000 so far. People are more inclined to follow you back if you have a credible number of followers. You will see momentum pick up once those milestones are reached.