Find people with similar interests in Twitter - Helpful Services

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The key point of twitter marketing is, following and being followed by people with similar interests!
Here are some services to help you find the twitter profiles with similar interests.

• http://followerwonk.com
• http://twellow.com
• http://wefollow.com/
• http://listorious.com/
• http://twitslikeme.efinke.com/
• http://justtweetit.com/
• http://twittieme.com/
• http://www.crazybob.org/twubble/
• http://twitdir.com/
• http://www.twitterel.com/
• http://www.citytweets.net/
• http://www.twitteradder.com/
• http://www.twannabe.com/
• http://www.monitter.com/
• http://followcost.com/

And finally the twitter advanced search tool:

• http://search.twitter.com/advanced

Some of these are twitter profile directories while some of these provide with features to seacrch the locations, tweets, interests etc.
If you have any more to add to this list, reply here and we will update the list.