Facebook, operator of the world's largest social network with more than 1 billion users, is changing policies for its Instagram unit as it looks for ways to increase revenue across its services. Instagram, popular with teens and young adults, reached more than 100 million users, Facebook chief executive Mark Zuckerberg said in September.
Facebook "sees teens as a digital gold mine," said Chester, whose group is focused on privacy issues. "We will be pressing the Federal Trade Commission to issue policies to protect teen privacy."
If users are younger than 18, then they "represent" that at least one parent or guardian has also agreed to content being used in marketing, according to the updated usage terms.
The changes are aimed at protecting members while preventing abuse, Instagram said in a blog.
Facebook shares rose 3.59 percent Tuesday to close at $27.71. The stock has lost 27 percent since an initial public offering in May.