Effective use of Twitter

You just gotta learn to use the tools of social networking.
There isn't any other option.
Saying "it's stupid; it's boring; I don't understand it" is like saying you don't want
to give up your horse in 1918.  You may not want to, but the world is moving ahead without you, and you're going to be left behind.

Here are 10 Tips on Using Twitter Effectively. 

Read them, know them.

Twitter works for book promotions.  Don't get left behind.