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This annual post is always the most popular one of the year. You might want to visit previous editions: The Best Web 2.0 Applications For Education — 2009 The Best Web 2.0 Applications For Education — 2008 The Best Web 2.0 Applications For Education — 2007 (You might also find The Best Ways To Create Online Content Easily & Quickly — 2010 useful)
I was quite impressed by Joyce Seitzinger's Professional Learning Environment (PLN) model that she presented at Deakin University in Melbourne this week. The first slide on the left shows a quadrant model in which she has used a work/office metaphor to define four discrete functions of a PLN. The first, the Staffroom is quite public, calling on high levels of communication and high profile, and involves the use of microblogging tools such as Twitter. This will work provided the user subscribes to a requisite number of other relevant user accounts, and can share their ideas and converse freely.