" Facebook also says that it's requiring all ad networks to delete any Facebook UIDs immediately "regardless of how they were obtained, " and it insists that it will enforce a "zero tolerance policy for data brokers.
That includes both a technical solution to the way UIDs can be "inadvertently" shared in the browser (to be released to developers early next week), as well as what Facebook describes as a clarification of it's policy on the use of UIDs and other private data received from Facebook.