If you use twitter this list will be a goldmine for you

Directories and User Search Tools
Just Tweet It A twitter directory sorted by interest
Twubble This tool will automatically find people who are compatible with your interests. However, if you follow too many people, then Twubble may recommend some people that you already followTwittie Me Search for similar users and advertise your twitter page
Twitdir Search for words in usernames, locations or descriptions
We Follow Follow people through popular tags
Twellow Find people by area of expertise

this is a small list of some you can find here
squidoo.com/twitterapps

if this list is beneficial to you please visit this lens and push the like button and help the owner
just a small thank you nothing much to ask
squidoo.com/free-debt-advice-for-uk-debt-management-

sorry unable to post live links