Mark,

In 2010, I wrote “The Social Network” and I know you wish I hadn’t. You protested that the film was inaccurate and that Hollywood didn’t understand that some people build things just for the sake of building them. (We do understand that — we do it every day.)

I didn’t push back on your public accusation that the movie was a lie because I’d had my say in the theaters, but you and I both know that the screenplay was vetted to within an inch of its life by a team of studio lawyers with one client and one goal: Don’t get sued by Mark Zuckerberg.

It was hard not to feel the irony while I was reading excerpts from your recent speech at Georgetown University, in which you defended — on free speech grounds — Facebook’s practice of posting demonstrably false ads from political candidates. I admire your deep belief in free speech. I get a lot of use out of the First Amendment. Most important, it’s a bedrock of our democracy and it needs to be kept strong.

But this can’t possibly be the outcome you and I want, to have crazy lies pumped into the water supply that corrupt the most important decisions we make together. Lies that have a very real and incredibly dangerous effect on our elections and our lives and our children’s lives.