It is available in Chrome browser. If you consider using more interactive tools with your students online it is a good addition to a blog. It gives your students more control on building a group website.
Resources:
http://techcrunch.com/2013/02/
http://www.freetech4teachers.
Check more creative tools at Chrome:
https://chrome.google.com/
such as
Balsamiq Mockups (wireframing tool - not free)
bomomo - drawing tool (free)
mind map - mapping tool
Autodesk 123D Catch - turn your photo into 3D model
etc.