Interesting article at MediaShift about how to use Twitter for collaboration. It includes lots of links to various education chats. There are, according to the article, over 150 Twitter chats on education-related topics. And Edutopia has a story about how to use Twitter to"grow your PLN." Here is another article about the value of Twitter in education from NovemberLearning.
To set up a Twitter account, here's all you have to do (fyi--I copied these instruction directly from the Edutopia story.)
1) Go to Twitter.com and click Get Started Now. Fill in the fields. Where they ask for your Full Name, we suggest using your real name if you want to use Twitter as a professional networking resource. This way, people can recognize you.
2) Once you've completed the registration process, click Create my account. It will ask you to enter some text to ensure you're not a robot.