Here are the links to three useful blog posts and articles about twitter. 

First up an article on how activity on twitter might help your presence in the google search engines:
http://www.indiesunlimited.com/2015/02/16/twitter-announces-deal-with-google/

“We struggle every day as authors to get the word out about what we do. It’s important to be firing on all cylinders. The agreement between Google and Twitter might help us in that endeavor. So, if you aren’t active on Twitter, maybe now is the time to reconsider. It will take a few months before the effect is noticed on Google, as the best estimate of the functionality taking place is sometime in the first half of the year. Happy tweeting!”

http://www.entrepreneur.com/article/241789

Secondly: Tips on how and when to tweet http://services4authors.com/2014/07/25/7-must-do-tactics-for-promotional-tweets/

We all know that Twitter should only be used for self promotion for about one in ten of the Tweets you send out. But that still…