Lookalike targeting is often leveraged when you identify a high-value audience and would like to find more people like them on Quora.
On Quora, lookalike targeting takes an existing audience and uses machine learning methods to find new people who have similar characteristics and activity. This new audience may have a higher likelihood of also being high-value, and it can be used like any other audience for ad set targeting.
In order to create a Quora Lookalike Audience, you need to have an existing audience based on the Quora pixel (Website Traffic Audience) or from a List Match audience. You can then start the Lookalike Audience creation process on the Audiences tab by clicking "Create Audience" and choosing "Lookalike."