Twitter CEO Jack Dorsey admitted Tuesday that Silicon Valley companies are not doing enough to combat abuse and misinformation online, and gave his social media platform a ‘C’ for “tech responsibility.”

Writing in an interview on Twitter with Kara Swisher, co-founder of tech news site Recode, Dorsey said his company has shifted the onus of dealing with abuse onto the victims, which he called a “huge fail.” He was then asked to grade Twitter on what Swisher dubbed “tech responsibility.”

Myself? C. We’ve made progress, but it has been scattered and not felt enough. Changing the experience hasn’t been meaningful enough. And we’ve put most of the burden on the victims of abuse (that’s a huge fail). #Karajack

— jack (@jack) February 12, 2019

When pressed to name specific problems with Twitter and outline concrete steps taken to fix them, Dorsey said “physical safety” and offline ramifications were top priorities.

A question we ask ourselves all the time. In the past I think we were trying to do too much. We’re better at prioritizing by impact now. Believe the #1 thing we should focus on is someone’s physical safety first. That one statement leads to a lot of ramifications. #Karajack

— jack (@jack) February 12, 2019

Swisher pushed back, saying that Dorsey and other Silicon Valley leaders deserve an ‘F’.

I grade you all an F on this and that's being kind. I'm not trying to be a jackass, but it's been a very slow roll by all of you in tech to pay attention to this. Why do you think that is? I think it is because many of the people who made Twitter never ever felt unsafe. #karajack

— Kara Swisher (@karaswisher) February 12, 2019

Social media sites like Facebook and Twitter have come under intense scrutiny for cyberbullying, fake news and bot accounts. Twitter has been accused of spreading false information, and U.S. intelligence agencies have concluded that Russia used social media to meddle in the 2016 election.

In the course of Tuesday’s interview, Dorsey also touched on company’s lack of diversity and the need to address the global ramifications of Twitter’s shortcomings. Dorsey said he dislikes the how Twitter incentivizes “outrage, fast takes, short term thinking, echo chambers, and fragmented conversation.”

I also don’t feel good about how Twitter tends to incentivize outrage, fast takes, short term thinking, echo chambers, and fragmented conversation and consideration. Are they fixable? I believe we can do a lot to address. And likely have to change more fundamentals to do so.

— jack (@jack) February 12, 2019

To read the full interview, click here.

Original Article