Education is about the free exchange of ideas. The exchange part is where the sharing comes in. Without sharing, there is no exchange.
At one time content was a commodity that was doled out for a price by institutions that housed the texts that contained the content. That is no longer the case. A combination of content on the Internet as well as the advance of social media and it is a whole new paradigm.
=> Of course this only works if exchanges of information takes place. <=
Via Gust MEES