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When Facebook launched its Open Graph protocol in April , blanketing the web with “like” and “recommend” buttons, it seemed obvious that one of the company’s goals was to use the resulting behavioral data to power a social search engine — one based on likes instead of links.

Is Facebook's Social Search Engine a Google Killer?: Tech News and Analysis «

http://gigaom.com/2010/06/25/is-facebooks-social-search-engine-a-google-killer/

The Race to Build the “Daily Me” Continues: Tech News and Analysis «

http://gigaom.com/2011/03/09/the-race-to-build-the-daily-me-continues/

Ever since the web first started to become mainstream, there have been attempts to build the “Daily Me,” a personalized newspaper that learns what you like or are interested in (does anyone remember PointCast?).