The case came about when employees at the Hampton Sheriff's Office in Virginia lost their jobs after expressing support for their boss' opponent by "liking" the opponents Facebook page.
Facebook and the American Civil Liberties Union became involved, both filed "friend of the Court" briefs for the case.
The decision reverses an earlier ruling that said "likes" were just button presses.
Do you think employers should monitor their employees' online posts and "likes"?
Share your thoughts on our Facebook page for a chance to be featured on Abilene Midday at 11:30.