Most of Facebook Inc. (FB)’s more than 800 million users are women. You wouldn’t know it from looking at the board, whose seven directors are all men.

The disconnect puts the social-media company at odds with others in the industry that have at least one female director, including LinkedIn Corp. and Google Inc., and from most big public companies in the U.S. Just 11.3 percent of the Fortune 500 had male-only boards last year, according to Catalyst, a New York-based nonprofit that researches women and business issues.

“We’re long past having to defend or explain why women should be on boards, given all the data that shows how companies with female as well as male directors perform better,” said Anne Mulcahy, former chairman and chief executive officer of Xerox Corp. and a director at Johnson & Johnson Co., Target Corp. and Washington Post Co. “It’s unfortunate when companies with a large percentage of women constituents don’t reflect that in their boardrooms.”