I like to use #hashtags# to target my audience when I send tweets; tweetchat.com is great for locating the best – sometimes a slight tweak to your hashtag can make the difference between reaching the right audience & only one or two people.
Monitter.com: This site lets you plug in search terms and track them!http://www.monitter.com/
Trendistic.com: This site monitors hot trends so you can see what people are Tweeting about and jump into the conversation! http://trendistic.indextank.com/
Reprinted from “The Book Marketing Expert newsletter,” a free ezine offering book promotion and publicity tips and techniques. http://www.amarketingexpert.com