TED talks is one of the leading web-communities that deal with spreading ideas that show vivid experience, and are thought-provoking notions. The intersting thing is that you can use this website to foster discussion of ideas and to share thoughts over a topic; especially in the classroom. the following website from Edudemic blog has one of the examples of some of the best TED talks for the year 2011. Test it with your students; they are really intersting!
I especially like the talk about “the demise of guys”, don’t miss this one!