Facebook has failed in its attempt to increase diversity in technical roles, the Wall Street Journal is reporting.

The company created incentives for in-house recruiters to bring in “diversity hires,” meaning prospects who aren’t white males or Asian males, but, as is the case with many tech companies the effort hasn’t necessarily led to offers from hiring managers.

“Former Facebook recruiters say they had mixed feelings about the extra-credit program,” according to the Journal. “Some were encouraged by the incentive, and identified a more diverse group of candidates. Still, they said it wasn’t enough to overcome a broader bias within Facebook and other tech companies for candidates who attended prestigious schools.”

Women and other “diversity hires” in tech have become a hot topic, and won’t go away soon because the industry has become such an important component of regional economies.

According to the U.S. Bureau of Labor Statistics, high tech industries constitute 12 percent of all jobs, but produce 23 percent of all output.

Therefore, groups left out of tech industry opportunities face increasing economic marginalization.

Here’s Facebook CEO Mark Zuckerberg in an interview with Y Combinator about the genesis of Facebook and the company’s “innovation culture.”