Congress has released Facebook CEO Mark Zuckerberg's prepared testimony ahead of Wednesday's hearing.

Zuckerberg will say: "We face a number of important issues around privacy, safety, and democracy, and you will rightfully have some hard questions for me to answer. Before I talk about the steps we're taking to address them, I want to talk about how we got here.

"Facebook is an idealistic and optimistic company. For most of our existence, we focused on all the good that connecting people can bring. As Facebook has grown, people everywhere have gotten a powerful new tool to stay connected to the people they love, make their voices heard, and build communities and businesses.

"Just recently, we've seen the #metoo movement and the March for Our Lives, organized, at least in part, on Facebook. After Hurricane Harvey, people raised more than $20 million for relief. And more than 70 million small businesses now use Facebook to grow and create jobs.

"But it's clear now that we didn't do enough to prevent these tools from being used for harm as well. That goes for fake news, foreign interference in elections, and hate speech, as well as developers and data privacy. We didn't take a broad enough view of our responsibility, and that was a big mistake.

"It was my mistake, and I'm sorry. I started Facebook, I run it, and I'm responsible for what happens here. So now we have to go through every part of our relationship with people and make sure we're taking a broad enough view of our responsibility." Full release here.