Twoppics, the stories behind the hottest topics on Twitter.

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Hot twoppic of the moment is, who else? Lady Gaga, who just became the most watched artist of all time on YouTube with over one billion hits. Her songs "Poker Face," "Just Dance" and "Bad Romance" have been viewed hundreds of millions of times apiece.

Hot twoppic of the day is Earth Hour 2010. On Saturday, people around the world will turn off their lights from 8:30-9:30 p.m. local time, to raise awareness about energy use and global warming.  Earth Hour began in Australia in 2007. In 2009, the movement went global with an estimated one billion people in 4,000 cities, turning off their lights. This year, U.S. landmarks like the Empire State Building and the Las Vegas Strip will participate.

Hot twoppic of the week is health care reform, or, as tweets refer to it, Obamacare. Despite the flurry of threats made against members of Congress after the passage of health care on Sunday, the Democrats are celebrating their health care victory. FOX News Radio's Rich Johnson has more.

This is @TheKateMalloy and those are your hot @Twoppics on FOX News Radio.

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