This gives passive candidates a chance to become active candidates, because those who want to use Facebook to find a job can now search 1.9 million jobs based on filters related to their career goals.

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Inorganic or mineral-based UVA filters titanium dioxide and zinc oxide, which don't break down as easily in sunlight and generally are not allergenic, are better options, according to Lawrence Gibson, professor of dermatology at the Mayo clinic in Minnesota.

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Based on innovative semantic technology, Jinni filters the universe of content through the lens of the user's personal moods and tastes.

ENGADGET: Jinni Taste Engine for TV and movies envisioned as a Google TV app

Superconductor Technologies, a company based in Santa Barbara, California, is building superconducting filters for mobile-phone base stations.

ECONOMIST: Superconductors are starting to become useful

New features unique to iPhone, iPad and iPod touch include New Tonight Trending, a social hot list based on what TV Guide users are watching, plus Watchlist filters for News and New Tonight, which show users only their favorites.

ENGADGET: TV Guide Mobile relaunches for iOS with a new look, links to streaming video and social networks

Helping viewers discover new content is a field suddenly filled with competition, from the social networking based to Dish Network's Hopper that records everything on primetime network TV and even filters out commercials.

ENGADGET: DirecTV HR34 DVR 'Genie' recommendations and autorecording get previewed ahead of fall launch