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http://www.hubspot.com/marketing-webinars/twitter-marketing/

The Twitterverse by Brian Solis and JESS3 - oneforty

A 2010 Edison research study showed that 42% of respondents hear about products and services through Twitter.

Twitter backgrounds - Custom and free Twitter background images

Our goal at Social Identities is to help everyone involved in social media and social networking create or improve their social identity. We believe that a consistent social identity is one of the most important parts of anyone's social network. Social Identities can create custom graphics and backgrounds for most of your social networking pages. http://www.socialidentities.com/
If you love Twitter, you'll love TweetBeep!

Twitter Alerts - TweetBeep.com

http://tweetbeep.com/
http://www.makeuseof.com/tag/9-useful-sites-for-finding-people-to-follow-on-twitter/

9 Useful Sites For Finding People To Follow On Twitter

Are you always looking for new ways to build your Twitter followers for personal use, business use, or both?

The Best Twitter Tools and Twitter Apps - oneforty

my French is a bit rusty, but I think I get a bit of the last comment. I find OneForty.com to be pretty helpful for finding lots of different, unique, and odd twitter tools. The aggregation aspect, and allowing developers to claim their apps after they've been aggregated is a great feature--and it looks like there are a number of features designed to help developers. Haven't checked the site for bugs yet, but overall looks very solid and is a great reference tool for finding twitter apps :) by tishgrier Feb 24

http://www.technologyreview.com/web/24353/ To deliver useful search returns from the so-called real-time Web--such as seconds-old Twitter "tweets" reporting traffic jams--Google has adapted its page-ranking technology and developed new algorithmic tricks and filters to keep returns relevant, according to a leading Google engineer.

Google Ranks Tweets

Twittereye.com is a large and growing directory of resources for users of twitter. It currently contains descriptions and links to hundreds of twitter related applications, web services, sites and blogs. These will be continously added to and updated.

What is twittereye.com? | Twittereye

http://www.twittereye.com/content/what-twittereyecom