The technology that helped usher in an internet revolution and democratic change in Tunisia and Egypt may be just as damaging to democracy as it is helpful. In March of this year (2011), Eli Pariser made this argument in his TED talk (watch below). Based upon his book, The Filter Bubble: What the Internet is Hiding from You, he describes an Internet that reflects back to the user exactly what he wants to see.
Within 24 hour of this being sent out by moveon.org, (of which the author is affiliated) the four copies within my library system went from available to checked out. Right now, I am waiting on a waiting list to read the full argument. See if your local library has a copy here: WorldCat