Advertisers can create “actalike” audiences by selecting an existing audience and allowing Pinterest to create similar audiences based on people's behavior patterns.

True. Pinterest's "actalike" audiences (also known as lookalike audiences) are a powerful targeting tool. Advertisers provide an existing audience, such as website visitors or customer lists, and Pinterest's algorithms analyze their characteristics and behavior patterns to find new users who share similar traits and are likely to be interested in the advertiser's products or services. This expands reach to new, relevant potential customers beyond the initial audience.