Facebook, Groupon, Twitter, LinkedIN, Netflix and more tech companie are hiding data on how many Blacks, Latinos, women, and other minorities..why is that?

So CNN's "Black in America" exposed the ugly side of Silicon Valley today. Its now out there. The Valley tech companies don't want minorities working there and they're not going to show you how many work for them..oh yeah..they don't care that you care.

A year and a half, a pile of paperwork, and dozens of interviews later, we have a little more insight -- but not much.Most of the companies stonewalled us, but the data we were able to get showed what one might expect: Ethnic minorities and women are generally underrepresented, sometimes severely so -- particularly in management roles. White and Asian males often dominate their fields.

Our investigation demonstrated how difficult -- and sometimes impossible -- gaining any insight into Silicon Valley's employee diversity can be. It shows a general lack of transparency in an industry known for its openness.

First attempt: In 2011, as part of CNN's Black in America series, CNNMoney reached out to 20 tech companies: the industry's 10 largest firms by annual sales and 10 smaller but prominent companies. We asked each for information about the race and sex makeup of their staff.

Only Dell (DELL, Fortune 500), Ingram Micro (IM, Fortune 500) and Intel (INTC, Fortune 500) played ball. Intel, in stark contrast to the rest of the tech industry, actually makes its employment diversity information public on its website.

"Intel believes that transparency with our data is the best way to have a genuine dialogue," Intel chief diversity officer Rosalind Hudnell told CNNMoney last week. "We are tech companies and data drives our business; we need to get beyond our fears that the numbers are a poor reflection on our individual organizations and work together to address the issue collectively. "

The other 17 companies refused to turn over their data. Having made little headway by asking the companies ourselves, the only way to compel them to release the data was through a Freedom of Information Act (FOIA) request.

Every U.S. company with more than 100 employees is required to fork over an annual report to the government, called the EEO-1, that categorizes U.S. workers by their race and sex. An independent federal agency called the Equal Employment Opportunity Commission (EEOC) collects the data, using it to play watchdog: It keeps a close eye on companies' hiring practices and occasionally assists in investigations.

We sent the EEOC a FOIA request on Aug. 18, 2011, and three weeks later it was denied. The EEOC said it is legally prohibited from releasing EEO-1 reports.

Read CNNMoney's FOIA requests and the government's responses

Second attempt: After consulting with experts and CNN's legal team, we learned the Department of Labor has access to EEOC data for some companies -- and unlike the EEOC, no federal statute bars the DOL from releasing the reports.

We re-filed the FOIA request to the Department of Labor on Nov. 1, 2011. It took more than a year for that request to be processed. 

On Dec. 7, 2012, we finally received the data, but for only five companies: Cisco (CSCO, Fortune 500), Dell, eBay (EBAY, Fortune 500), Ingram Micro and Intel.

What happened to the other 15 companies' information is complicated.

The Labor Department has no authority to release EEO-1 reports for companies that aren't federal contractors. That knocked out 10 companies: Amazon (AMZN, Fortune 500), Facebook, Groupon (GRPN), Hulu, LinkedIn (LNKD), LivingSocial, Netflix (NFLX), Twitter, Yelp (YELP) and Zynga (ZNGA).

But even contractors may block the release of their data. Apple (AAPL, Fortune 500), Google (GOOG, Fortune 500), Hewlett-Packard (HPQ, Fortune 500), IBM (IBM, Fortune 500) and Microsoft (MSFT, Fortune 500) all submitted written objections, successfully petitioning the Department of Labor for their data to be excluded on the basis that doing so would cause "competitive harm."

Those five companies declined or ignored CNNMoney's requests for comment on their unwillingness to turn over their data. 

 So Facebook is holding on to data that will let us know if Blacks and other minorities are working there..because  "submitted written objections, successfully petitioning the Department of Labor for their data to be excluded on the basis that doing so would cause competitive harm."How Sad. In 2013.

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