Dear Mark Zuckerberg,

How can it be? Facebook will file for an IPO this week without a single woman on its board of directors. Are you kidding? Without women, where would Facebook be?

In June The PEW Internet and American Life Project revealed that 58 percent of all Facebook users are women. Women do most of the status updating, make most of the comments, upload most of the photos and hit the Like button most frequently.

I read in the paper recently that your revenue strategy relies heavily on advertising.  Haven't you heard? Women influence 80% of consumer spending.

Maybe your board thinks that because women are so busy socializing on Facebook they're too busy to achieve the necessary credentials for board service. You should know that women comprise over half the workforce and make up about half of all management positions. A third of all businesses are owned by women, employing more than 13 million people and generating $1.9 trillion in sales.

Here's an idea: Put Sheryl Sandberg on your board. Starbucks did. And so did Disney. She'll be an insider, but that's better than having no women directors.

You may be aware that we recently published the 2020 Women on Boards Gender Diversity Directory, a list of over 1,000 companies categorized by the gender diversity of their boards. It's outrageous that Facebook will launch as a Zero “Z” company.

Mark, we encourage you to do better. Take the 2020 Challenge. Add a woman within two years and get to 20% by 2020.  Your Facebook users want and deserve a seat at the table.