Jeff Sonderman, Poynter:

The [National Labor Relations Board] is standing up for the rights of workers to discuss wages and working conditions. The legal term is “concerted activity” — when workers take action to collectively discuss their employment terms — and the board says that’s just as protected on social media as it is in the company break room.

What’s not protected, as far as the National Labor Relations Board is concerned, is acting like an idiot. A few shining examples are included in the Poynter piece.