Facebook has launched an update for Promoted Posts, so advertisers can better target countries where the majority of their fans are.
"We heard your feedback that using Promoted Posts in certain instances caused an unexpected increase in out-of-country engagement," says an update from Facebook Marketing. "We have released an update to Promoted Posts to target spend to the countries where most of your fans reside by default."
Advertisers can still control targeting on their own, if they want to change the default, of course. You can still refine the audience that is eligible to see your posts, Facebook explains. "This can be done by targeting your Page post to specific locations and audiences," the company says.
Facebook has a Help Center article about how to control who sees your Page's posts here.