I recently joined twitter and like it alot but I am still learning the ropes best thing to do to start with is follow the sites and blogs you regularly visit for example I regularly read the Barnes & Noble blogs so I follow @BNBuzz. You can link your twitter account to your profile here so that if people click on your profile here they can see your recent tweets and easily select to follow you.
I found this article really usefull as it gave me a better undestanding of hashtagging even though it's aimed at authors(which I'm not)
http://warriorwriters.wordpress.com/...ter-tuesday-2/
The more you follow and the more followers you get the more interesting it is however you can sometimes get overwhelmed with junk in which case just unfollow
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