How does Custom Audience Matching & Lookalike work?

We target your list with cookie-less data.  We match first-party data whether it’s phone numbers, names, emails, physical addresses, domain URLs, mobile device ids, HHIP addresses, other wifi addresses and compares it to offline data (like census and income data) [...]

Can Facebook share my email/phone list or use it?

No, they can't.  Below is their policy on lists that we upload to use for Custom Audience matching.   Below is their policy or click here: https://www.facebook.com/ads/manage/customaudiences/tos.php or download this pdf: facebook_audiences_data_security_overview  

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