Facebook Audience is a group of Facebook users that you can use to target your ads. Such a group can be created from data collected by your customer management, mailing system, an Audience Scan at Sotrender or based on the behaviours of your users on your website, app, or game.
User details are encrypted when sent to Facebook so that no one can see any of their details.
Using Audiences is a great option for businesses that are gathering leads through different channels but would like to target users with custom messages on Facebook.
Audiences can be also used for creating Facebook Audiences and they can be shared across multiple ad accounts.