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“This consumer complaint raises a number of concerns about Facebook’s privacy policies and practices,” the committee leaders wrote in the letter. “Facebook’s systems lack transparency as to how they are able to gather personal information and synthesize that information into suggestions of relevant medical condition support groups. Labeling these groups as closed or anonymous potentially misled Facebook users into joining these groups and revealing more personal information than they otherwise would have. And Facebook may have failed to properly notify group members that their personal health information may have been accessed by health insurance companies and online bullies, among others.”

Instagram said it will require birthdates from all new users starting on Wednesday, expanding the audience for ads for alcohol and other age-restricted products while offering new safety measures for younger users.

The policy change could help stave off passage of costly child safety and data privacy regulations as lawmakers and family safety groups in the United States, Britain and elsewhere criticize the app for exposing children to inappropriate material.

71% of senior-level execs were worried about risks associated with social media, with 13% saying they are “very concerned.”

listed the potential for negative comments about the company (36%), disclosure of proprietary information (32%), and out-of-date information (18%) as the most worrying. They were less worried about accidental exposure of personally identifiable information, fraud, and corporate executives (i.e., themselves) doing something embarrassing or incriminating on line.

Among public companies, the top concern was disclosure of proprietary information (50%), followed by negative comments, out-of-date information, and fraud, each at 17%.