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Only about 20 percent of the apps disclosed any information about the program’s privacy practices, and the FTC said many disclosures were inadequate.

‘‘Many consisted of a link to a long, dense and technical privacy policy that was filled with irrelevant information and would be difficult for most parents to read and understand,’’ the report said.

More than 20 percent of the apps examined included links to social media services but few informed consumers about them before the program was downloaded. The FTC said the result was that children could post comments, photos or videos that could harm their reputations or offend other people.