What is an ideal source audience size for creating a lookalike audience?

For creating a lookalike audience, the ideal source audience size is typically in the range of 1,000 to 5,000. This size is optimal because it provides enough data to improve the algorithm's ability to identify common characteristics among your existing audience, which it can then use to find new audiences that share similar traits. A source audience that is too small may not have sufficient data for the algorithm to work effectively, leading to less accurate lookalike profiles. Conversely, an audience that is too large could dilute the specificity and relevance of the characteristics being analyzed, making it harder for the algorithm to pinpoint the desired traits for targeting.

Choosing a source audience size within the 1,000 to 5,000 range allows for a balanced approach, ensuring that the lookalike audience generated has a good chance of being effectively aligned with the interests and behaviors of your original audience.