A while ago Edudemic published their 2012 A-Z Guide to Twitter Hashtags. This is a great resource, and now there is a new way to view it thanks to Online Courses. Check out this infographic that lets you know the most popular educational hashtags. They are categorized by color into: education, most popular according to Edudemic, technology, Higher Ed, subject specific, specific areas/roles and K-12.
Via Beth Dichter