Facebook now lets businesses match user IDs across Messenger and their own apps, sites

Facebook previously gave businesses one ID when someone contacted them on Messenger and another when that person logged in to their apps or sites.

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From http://feeds.marketingland.com/~r/mktingland/~3/xdIJNIXh0W4/facebook-now-lets-businesses-match-user-ids-across-messenger-apps-sites-212384

source https://jessicaevieblog.wordpress.com/2017/04/19/facebook-now-lets-businesses-match-user-ids-across-messenger-and-their-own-apps-sites/