Twitter

Twitter is an amazing and fun social media tool that traces its roots to mobile texting, thus the 140 character limitation. Twitter also has several fun and interesting services that have been built. Here are but a few:

• Tweetscan - Scan public tweets. Great for seeing what people are saying about your brand, product or service.
• Summize - Scan public tweets. Another service that allows you to see what people are saying about your brand, product or service. Also has a few more bells and whistles.
• Twittearth - This is a very cool tool that provides a 3 dimensional view of the earth and shows tweets geographically in real time as they are written. I like the little Twitter representations of people as well.
• Twitter Blocks - Shows the people you are following and who they are following and who is following you. Very cool graphical view.
• Twitter Fan Wiki - But if you really want to explore, go to this Wiki and check out all the Mashups.

Here is a fun and informative video on what Twitter is - "Twitter in Plain English"