If you have a lot of twitter followers to broadcast to, you will have better reach for your products & services when you send out a tweet.

You can easily promote your business once you have lots of twitter follower.

Twitter is mainly for the famous personalities and if you want to get followed by others then you should be interesting and informative as well, as twitter allows only 140 characters to express your feelings and thoughts with others.

The main Purpose is making more DA and PA (Check on internet what they are! )
so by that way u will be seen better in SERP
sincerely,
Ali

1. Increased popularity and visibility
2. Effective marketing
3. Increased traffic
4. Increased Communication