Edmodo | Social media kitbag | Scoop.it
This is more a tool for those training journalists and I have just signed up to try it. The site's blurb calls it "Secure Social Learning Network for Teachers and StudentsEducation 2.0 - Free Private Microblogging in the Classroom".

However, after watching the tutorial I see it would be good for real-time file sharing and social learning through collaboration and curation. Also, it offers a way to set up assignments and grade them. I will be trying this. Anyone who already has please add comments.

Please add your comments or experience of using this tool in the box below so everyone can benefit.