By Walt Hickey

Welcome to the Numlock Sunday edition. Each week, I'll sit down with a writer behind one of the stories covered in a previous weekday edition for a casual conversation about the story they wrote.

This week, I spoke to my friend Sarah Frier, who covers Facebook for Bloomberg. She’s appeared here before, but I wanted to talk to her this week specifically because Facebook had an unrelentingly weird week and I didn’t want to let it slip by without talking about what really happened.

We spoke about Facebook’s no good very bad week, what’s gone wrong at the company this year, and the real core of the company’s issues.

Sarah can be found on Twitter here and you should follow all of her coverage at Bloomberg. She’s also coming out with an as-yet-untitled book about Instagram.

This interview has been condensed and edited.

Walt Hickey: This week was three days long and Facebook had a bad day. All three of them. What went down this week?

Sarah Frier: The main problem this week was the…