Twitter for Professional Development

Twitter Vs Paid Professional Development
Resource: An A-Z of Twitter for Educators
Twitter Hashtags for Education
Calendar Schedule of Twitter Education Chats
The Twitteraholic’s Ultimate Guide to tweets, hashtags, and all things Twitter

Twitter in the classroom

50 Ways to Use Twitter in the Classroom
How to Use Twitter in the Classroom
Twitter Time- great tips for classes starting to tweet 

Twitter for Teachers