Eli Pariser's blog, with links to his good TED talk and brilliant book of the same name. The book provides a relentlessly well-written and hard-to-fault argument about the dangers of confirmation bias, as well as an evenly-handed discussion of the many benefits of personalization. The site offers a cut-down version of the advice offered in the book which is aimed to maintain the value of filters (which are useful and essential tools to deal with infoglut) without losing the essential diversity that filter bubbles can and do destroy. Excellent stuff, packed with fascinating and well-researched information, quotable sentences and thought-provoking analysis.