A lookalike audience is a type of custom audience used in social media targeting - popularized by Facebook , LinkedIn , Twitter , Snapchat and TikTok it's . Also known as an Actalike audience on Pinterest.
It helps you target audiences with similar characteristics to existing ones. This audience is created from a source audience (i.e. fans of your Facebook page, email list), and from this list Facebook will identify common characteristics .
Here’s an example: let’s say you have many people visiting your website. With a Lookalike Audience, you could easily advertise to people similar to your visitors.
In order to create a Lookalike Audience, there must first be a custom audience to act as a base or seed list.