What Are Facebook App User IDs?

Facebook offered more details on a targeting field for custom audiences that it introduced at its Facebook Mobile DevCon 2013 in London earlier this month: app user ID, which was included in its latest software-development kits.

Facebook offered more details on a targeting field for custom audiences that it introduced at its Facebook Mobile DevCon 2013 in London earlier this month: app user ID, which was included in its latest software-development kits.

Here is more information on the app user ID field from a post on the social network’s developer blog:

Custom audiences let developers and marketers find their existing customers on Facebook. Using information you know about your customers, you can reach the right people on Facebook that you want to connect with.

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