According to Recode, Facebook COO Sheryl Sandberg is in Washington D.C. this week to try and smooth over concerns that the social media company has not taken responsibility for the flourishing of Russian disinformation campaigns and fake news that demonizes Black Lives Matter on its website.

But back in Seattle, at the GeekWire tech summit, University of Washington computer science and engineering chair Ed Lazowska had this to say about Facebook: "Give me a break."

In the interview with GeekWire, Lazowska said that Facebook needs to take responsibility for its problems, then dig in and solve them. "And I just think it's fallacious for them to argue that they don't have a responsibility and that they haven't had influence," he said. "You can't wash your hands of this."

Lazowska expressed concern about Facebook's revenue model, which relies on information it harvests from users and ads. He also cited Facebook ads selling bump stocks days after the Las Vegas shooting as evidence of a continuing problem.

"They've got to be able to do better," he said.