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Until recently, Facebook’s mission statement was to make the world more open and connected. What the company probably didn’t expect was that it would also become a breeding ground for hate.

That’s the issue the Silicon Valley internet behemoth is grappling with, following a ProPublica report last week that found marketers can target advertisements at people Facebook thinks are “Jew Haters.” The revelations caused an uproar, sparking a debate about online ads, and tech company’s responsibilities.

On Wednesday, Sheryl Sandberg said Facebook is responding to these criticisms by increasing enforcement against hateful ads and also increasing oversight of the automated processes. This is important because, as many people theorize and Sandberg suggests, the automated systems that come up with ad targeting groups such as “mothers,” “people who live in San Francisco” and “birders” was likely responsible for creating a “Jew Haters” category marketers could target advertising to.

“We never intended or anticipated this functionality being used this way – and that is on us,” she wrote. “And we did not find it ourselves – and that is also on us.”

Finally, Sandberg said Facebook is also going to encourage people to alert the company about abuses of its ads system.

She also reiterated that hate has no place on Facebook.

“Seeing those words made me disgusted and disappointed – disgusted by these sentiments and disappointed that our systems allowed this,” she wrote. “As a Jew, as a mother, and as a human being, I know the damage that can come from hate. The fact that hateful terms were even offered as options was totally inappropriate and a fail on our part.”

You can read her full post below: