From Electronista:

Facebook has announced plans to allow external marketers to mine new customers from the social network using personal information, such as phone numbers, email addresses, Facebook users’ unique UID code, and other identifying characteristics. The targeting option will be available to advertisers next week. Facebook says advertisers will have to seek their customers’ permission to use the data for marketing purposes before they proceed.

Facebook’s customers? Advertisers.
Facebook’s product? Their users.
Just a reminder.