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Mixable, is positioned as an e-learning environment that empowers students, and can be used as a little study room and course library inside Facebook.

Drawing on course registration data, Mixable invites students in virtual rooms with classmates in each of their courses. Once there, it lets them post and start comment threads about links, files, and other materials that might be relevant to the course — or not. The point is, there is no administrative authority determining what should (or must) be posted or discussed, and students are free to abstain from participating — just like on Facebook. Professors can join in, but they don’t run the show. And students can choose to make posts viewable by some classmates and not others. “In essence, the conversation is owned by the student,” says Kyle Bowen, the director of informatics at Purdue.

Purdue CIO Gerry McCartney says it made sense to position it as an application within Facebook. He cites the quote attributed to the bank robber Willie Sutton who, asked why he robbed banks, said "because that’s where the money is." Says McCartney: “So why go to Facebook? Because that’s where the students are.”

What can colleges learn from Facebook?

Where Facebook has shown unique value is as a data-gathering tool. Never has a website been able to learn so much about its users. And that is where higher education should be taking notes, said Angie McQuaig, director of data innovation at the University of Phoenix, at the 2010 Educause conference on Friday.

If Facebook can use analytics to revolutionize advertising in the Web era, McQuaig suggested, colleges can use the same principles to revolutionize online learning.

Trending right now across Twitter, Facebook, MySpace, and Digg

People organically develop their PLNs when chosing to participate in social media like Twitter, Facebook , blogs, and through learning networks like Classroom 2.0.

While most of our classrooms were built under the assumption that information is scarce and hard to find, nearly the entire body of human knowledge now flows through and around these rooms in one form or another, ready to be accessed by laptops, cellphones, and iPods. Classrooms built to re-enforce the top-down authoritative knowledge of the teacher are now enveloped by a cloud of ubiquitous digital information where knowledge is made, not found, and authority is continuously negotiated through discussion and participation.

This new media environment can be enormously disruptive to our current teaching methods and philosophies.

Our physical structures were built prior to an age of infinite information, our social structures formed to serve different purposes than those needed now, and the cognitive structures we have developed along the way now struggle to grapple with the emerging possibilities.