Wikipedia has fascinating articles on ideas and people. One entry I was recently reading was on Marshall McLuhan. McLuhan is probably most famous for the statement that "the medium is the message," which basically states that the context of an idea is important. McLuhan wrote some of the most influential books on media and the way people consume it.
McLuhan passed away before the Internet, which is too bad, because he would have a lot to say about an age made of Skype, texting, and, well, Wikipedia. He probably would see our media as harmful to society and as a way for power structures to maintain the status quo.