Advertisers using similar audiences lists don't need to exclude people from original re marketing lists.Why is this the case?

**Similar audiences lists automatically exclude people so that only new leads are reached.**This means that when you use a similar audiences list,you are targeting new users who have similar behaviors and interests as those on your original re marketing list,without re targeting the individuals from the original list.This helps advertisers expand their reach to potential new customers while ensuring they are not redundant in their advertising efforts to those who are already familiar with their product or service.