Livebinder owns all the internet it seems! This is another great Skype in the classroom livebinder, if the answer is not in here, your question really was naff.
As usual, in order to make this list, a site had to be:
* accessible to English Language Learners and non-tech savvy users.
* free-of-charge.
* appropriate for classroom use.
* completely browser-based with no download required.
Teachers are finding new ways to use Twitter to engage their students, build stronger academic and professional relationships, and to share information in a richer learning environment, and they are using tools like these to bring more fun and functionality to the process.