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The social-networking site Facebook is being used for more than socializing. In Colombia, a Facebook page dedicated to protesting the Revolutionary Armed Forces of Colombia, that country's largest rebel group, is helping organize thousands of people in cities around the world.

Actor and former Tennessee Sen. Fred Thompson dropped out of the Republican presidential contest Tuesday. He had said he needed to win in South Carolina, but finished third there. Melissa Block talks with Rich Galen, former senior adviser to the Thompson campaign.

The economy is emerging as a big issue in the presidential campaign. Presidential contenders in both parties are touting their economic plans for reviving the ailing economy. Upcoming contests will be critical for some candidates.

Three of the leading GOP candidates for president all campaigned in South Carolina on Friday. We have three reports: David Greene is traveling with Mike Huckabee; Debbie Elliot is on the scene with John McCain; and Adam Hochberg is watching Fred Thompson.

The Federal Reserve's decision to cut a key interest rate this week prompted a burst of activity in the mortgage market, as homeowners tried to figure out whether to refinance. Russell Rothstein, the director of mortgage lending for Beacon Mortgage in Rockville, Md., offers advice.

As financial markets went on a roller-coaster ride this week, individual investors watched with growing anxiety. In Seattle, members of a women's investment club say they had a good year in 2007 and won't let 2008's rocky start cause panic.

The Centers for Disease Control and Prevention wants adults to remember that vaccines aren't just for kids. Whooping cough, shingles, tetanus, and several other illnesses are still big problems in the U.S., mostly because adults aren't getting the shots they need.

Conversations with voters in South Carolina reinforce suspicions that Sen. Barack Obama is having trouble attracting support from white Democrats. He has strong support among blacks, who make up about half the state's Democrats.

Former President Bill Clinton is brushing off criticism that his campaign-trail rhetoric unfairly targets Sen. Barack Obama. Obama has complained that he's not sure who he is running against: Sen. Hillary Clinton, her husband, or both.

The volatility in stock markets around the world appears to have subsided, at least for now. But the past 10 days have been a wrenching ride for investors, and many analysts still don't understand what set off the slide. NPR's Adam Davidson profiles two entrepreneurs and how the market turmoil affected them.