I ran across this TED talk about online “Filter Bubbles”. Eli parses the idea perfectly and it echoes my thoughts and fears on the subject really well.
For a somewhat creepy experience, log into Google+ and search for a person you know by first name. In my results, after typing a first name, I find their LinkedIn, Facebook, occupational pages, blogs, websites – an entire search results page devoted to the person who Google thinks I want to look for.
It seems innocuous at first, but combined with the “filter bubbling” and articles like this one, it makes for a pretty sticky area of privacy issues, cloistered viewpoints, and lurking issues which I think we have yet to grasp the potential of.