To increase the followers in twitter you just tweets good messages over twitter, which attract more and more people and give a fast response. You also follow the tweets which you like the most.
Twitter is micro blogging. Twitter, and 'tweeting', is focused on broadcasting daily short burst messages around the world, with the hope that your messages are useful and interesting to someone.
Depending on Twitter alone is really a risky game. For some it works great, for other it doesn't. Twitter success is also very niche dependent!
Selecting tweeter for promoting business is not bes but a way. You cannot post comment more than 140 characters and it is necessary to post good informative comment on twitter which attract people. You are not able to target specific age group or class of people, it all depends on your small but informative post to increase the follower.
If you want people to follow your post, you need to publish quality content, commenting on relevant topics. Another way is to retweet relevant content. You can promote your Twitter account via other channels.
compare to facebook , twitter is an more difficult to increase the followers, Pages likes and Engagement , i am using likesasap tools for increasing twitter followers , so try this one .