How do I set up and use a Lookalike audience?

Lookalike audiences are effective for finding potential customers in brand new territories, once you have established in one location. For example, you have a salon in London and you are opening a new salon in Birmingham – you would create a LLA audience using your London customer database as the seed and then at the Ad Set level, filter this down to those living in Birmingham. This can also be used for brands looking to expand internationally – such as selling in America. You would take your UK existing customer database and create a LLA of those people who are in the States and use this, instead of a Core Audience.