the need to manually

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2. It allows you to show only the most relevant ads at all times.

Custom audiences are great for many things, such as reaching people who don't open your emails, moving potential customers through the sales funnel, and re-engaging lost customers, but you don't want them to be spammy. Having up-to-date lists is crucial to ensure each Facebook ad reaches only the people who should see it at that time.

This also includes opt-outs: if someone chooses not to gcash data contact you, you shouldn't show them Facebook ads with Custom Audiences, so by syncing your email lists and segments, you can ensure you're complying with your Terms and Conditions.

3. Prevent the Wrong People from Seeing Your Ads

Related to the previous point, you can also use Facebook Custom Audiences to exclude people from seeing your ads. How many times have you visited a website and purchased something, only to immediately see retargeted ads from that same website, promoting the product you just bought, or worse: a discount for new customers you didn't even know about!

By excluding some audiences from your ads and keeping them updated, you'll ensure not only that you don't waste your budget, but also that you're reaching people who will benefit from seeing your Facebook ads.