A step by Step Guide to High-Converting Facebook Ads - Lookalike Audiences Advertising

14th April 2015

What are Custom and Lookalike Audiences?

You can upload a list of your own customers, subscribers or users to Facebook. Facebook cross-references the emails you provide with its database and creates a Custom Audience made up of the people on your list who also used that same e-mail to sign up to a Facebook account. You can then target adverts to just this group.
Even better, you can generate something called a Lookalike Audience from your Custom Audiences. Facebook will look at all the profile data of the people in your custom audience and create a new list of Facebook users that share similar interests and demographics. This is a huge shortcut and a 'safe option' when it comes to optimising campaign targeting.
https://www.driftrock.com/blog/facebook-advertising-guide-lookalike-audiences