The internet giant believes this tool "could have some impact" on its ad business, but felt that it was "more important" to provide control over data.

You'll likely have to wait a while longer to use this tool yourself. It's only rolling out to Ireland, South Korea and Spain, and other regions will see it in the "coming months" as Facebook gauges its reliability.

As with some Facebook decisions, there are strong technical and legal incentives behind this privacy upgrade. Facebook has been accused of giving device and service partners too much access, and a code flaw allowed continued data access months after the company officially wound down its data integrations. This might mitigate future concerns by putting more power in the user's court -- you don't have to wait for Facebook to take action before cutting off a rogue app. And when Facebook is already paying for past privacy failures, it likely doesn't want to risk future penalties due to inaction.