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http://manageflitter.com/

ManageFlitter - Fast & Easy Unfollowing for Twitter

The different lists of active vs. inactive tweeters, people not following back, etc. are REALLY helpful.
http://muuter.com/

Home | Mute noisy Twitter friends (for a while) - Muuter.com

Here's where m uu te r comes valiantly in your rescue: you define the twitter name and the time you want to mute 'em (or muute 'em?)
http://lrnchat.wordpress.com/ 9:31:55 am dan_steer : @ lrnchat I’m sure I shouldn’t be paying attention to #lrnchat = I’m busy and trying to stop working for the day… #lrnchat

#Lrnchat Blog

6 Tips for Using the @ sign in Twitter | Both Sides of the Table

http://www.bothsidesofthetable.com/2009/08/04/6-tips-for-using-the-sign-in-twitter/ There is much confusion on how to use the Twitter @ sign – even amongst daily Twitter users. So as part of my ongoing series Twitter Insights , I wanted to cover how the @ actually works (even experienced users may be surprised by some of the points)

Yammer : The Enterprise Social Network

Only people with a verified company email address can join your company network. https://www.yammer.com/
The "ad-captchas" you see on this page exist for two reasons.

Social Networking For Schools

http://www.twiducate.com/login.php
For the past 3+ years we had a great time fulfilling your desire to see other people's conversations on Twitter. Unfortunately, we are really sorry to announce you that Bettween is ceasing operations indefinitely. http://bettween.com/

Bettween | Easily Track and Share Twitter Conversations