Meta (Facebook) Machine Learning Case Study: Illegal Items Detection

Jay Feng
11 min readOct 25, 2022

Image from Pixabag

Question

Let’s say you are designing a marketplace for your website.

Selling firearms is prohibited by your website’s Terms of Service Agreement (not to mention the laws of your country). To this end, you want to create a system that can automatically detect if a listing on the marketplace is selling a gun.

How would you go about doing this?

What is the interviewer looking for?

The interviewer is looking for a few points here:

  • Can you properly scope the size of this project?
  • Can you apply machine learning to a business goal?
  • Can you design a machine learning system from the ground up to production?

We’re going to start with a four-step framework here:

  • Clarification of the Machine Learning Question
  • Making and Setting Assumptions of the Problem Scope

Clarification of the Machine Learning Question

Let’s start out with

Clarifying Question 1

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Jay Feng
Jay Feng

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