Now that I have multiple accounts on Twitter (for different audiences), it has become difficult to maintain them. Here are some tools I discovered to make using Twitter a bit easier.
TweetLater: Helps you manage your different Twitter accounts, including automatically following those who follow you - a big time saver
WeFollow.com: A searchable directory for top Twitter users by category
TweetDeck: A customizable dashboard/browser to maximize your Twitter experience
Twitterberry: A mobile application for using Twitter on your Blackberry
[Note: I'm just scratching the surface here. If you've found a Twitter tool that you just love, post a comment. I'd love to hear about it!]
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