Stay-at-home moms: Reader, let me take your hand and guide you to a realm of the internet that I inhabit, which you probably don't even know exists. Welcome to Mom Twitter, where the discourse vacillates between dumb and enlightening. Today's topic? What exactly the term "stay-at-home mom" means, and whether "work"—presumably meaning formal participation in the labor force—disqualifies you. Perhaps you're thinking, Why should I, a reader of Roundup, care about any of this at all?