Are Facebook posts are protected speech?

Washington (CNN) - The high court will hear oral arguments Monday in the first examination of free speech rights and social media.

The outcome of the groundbreaking case, Elonis v. U.S., could decide the limits of what you post online.

Tara Elonis asked for a protective order from her soon-to-be ex-husband, Anthony.

Not long after, he posted a message on his Facebook page seemingly directed at Tara:

"Fold up your protection from abuse order and put it in your pocket. Is it thick enough to stop a bullet?"

It wasn't the first time Elonis had posted harrowing messages on his Facebook page.

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