Blog.com is a free blogging platform that allows for multi-author blogs, themes, and other features. It can be used in classrooms by creating blogs for communicating class information to parents, posting daily lessons for absent students, and having students write blog posts. Benefits include being easy to use, free, and allowing more students to participate. Potential downsides are that it is time consuming to set up, has a learning curve, and could enable cyberbullying if not monitored.