WASHINGTON — “Like” the First Amendment? Then prepare for a fight, as courts and employers figure out whether a simple click on Facebook deserves free-speech protection.

It’s 21st-century technology meets an 18th-century Constitution, and the real-world implications are starting to erupt.

In rural Mississippi, two firefighters and a police officer are serving 30-day suspensions because they hit “like” on a controversial Facebook post.

In Virginia, a sheriff’s department employee said he was fired for “liking” a page sponsored by the sheriff’s political rival. One federal appellate court already is being asked to weigh in; others surely will follow.