President Obama’s reelection campaign “pioneered a pathway for political campaigns to reach voters through Facebook when it released an app that helped supporters target their friends with Obama-related material,” Yahoo News reports.

“But as the 2016 presidential campaign approaches, Facebook is rolling out a change that will prevent future campaigns from doing this, closing the door on one of the most sophisticated social targeting efforts ever undertaken.”

Said Obama digital chief Teddy Goff: “It’s a fairly significant shift. The thing we did that will be most affected — by which I mean rendered impossible — by the changes they’re making is the targeted sharing tool.”