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Thanks to Gillette, the idea that you can make money by giving something away is no longer radical. But until recently, practically everything "free" was really just the result of what economists would call a cross-subsidy: You'd get one thing free if you bought another, or you'd get a product free only if you paid for a service.

What it is:  Education Diigo offers k-12 and higher ed educators premium Diigo accounts!  The premium accounts provide the ability to create student accounts for whole classes, students of the same class are automatically set up as a Diigo group so they can easily share bookmarks, annotations, and group forums, privacy settings so that only classmates and teachers can communicate with students, and any advertisments on Education Diigo are education related.  If you aren’t familiar with Diigo, it is a social bookmarking website where students can collaborate on the web.  Diigo works in to a project based learning environment nicely and allows for exploratory learning and collaboration.  

Education Diigo is an outstanding place for students to solve problems together.  Provide students with a problem and send them on a web scavenger hunt to find the answer, students can post their findings and notes about their findings on Diigo.  Students can collaborate online to solve the problem.  Education Diigo is also a great place for “teachers to highlight critical information within text and images and write comments directly on the web pages, to collect and organize series of web pages and web sites into coherent and thematic sets, and to facilitate online conversations within the context of the materials themselves.”  This feature makes Education Diigo a great place to create webquest type lessons and virtual field trips around the web.    Diigo also allows teachers to collaborate and share resources among themselve. Education Diigo is a must for students who are learning to complete web-based research!

"Our kids today will give everything [in terms of personal information] away, but it's not at all clear how this will shake out in the long run,"

Third-party applications, he argued, can take that data outside of the friendly confines of a social networking site and combine it with data from other sources to piece together enough information to steal a person's identity.

Hoffman illustrated how social connections are made online and the ease with which a stranger can become part of a network.