A silicone gel implant (left) and a saline gel implant. The FDA agreed to let implants return to the market in 2006, but stipulated that manufacturers track long-term side effects. Spencer Platt/Getty Images hide caption

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Drug firms fear that being "liked" on Facebook could get them in trouble with the FDA. iStockphoto.com hide caption

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Why Drug Companies Are Shy About Sharing On Facebook

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Cans of fruit-flavored Four Loko in the liquor department of a convenience store in Miami in 2010. Joe Raedle/Getty Images hide caption

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