> Since they're a huge public company, they have to communicate facts about their business to investors, with some precision, and so they expose you to terms like these.
Isn't a term like "content vertical", though, used with investors precisely for its imprecision? That is, it imparts of flavor of mysterious business strategy and arcane MBA knowledge to the most mundane of activities: creating multiple sub-websites that focus on different content.
To extend your analogy, if a publishing company wants to precisely communicate the decision to publish new magazines, they'd say "this quarter we added four new magazines on the topics A, B, C, D to our roster." If they wished to make it sound like something deeper was going on, they might say, "we're deepening our reach into multiple markets by adding new content verticals."