What is a Facebook Lookalike Audience?

It’s a tool on Facebook’s Ad Manager that allows you to create a custom audience of people on Facebook’s Ad Network that Facebook identifies as having common qualities of people that “look like” another source audience (your email list, pixel data, a third-party data partner, etc.).

For example: with your current customer list, you can upload it to Facebook and then tell Facebook to essentially, “go find people just like this and sell to them.”