"The Federal Trade Commission holds a workshop today that will look at how companies should disclose incentives on social-media "platforms that allow only short messages or a simple sign of approval," says FTC advertising practices chief Mary Engle

Incentives for consumers to "like" companies on Facebook fall into a "gray area" that depends on whether the number of likes a company has influences consumers in choosing their products, Engle says. The FTC's advertising endorsement guidelines require compensation to be disclosed, as with Twitter hashtags such as "#paid," she says"
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