Each post is written from what the product knows to be true about you: your business name and trade, the towns you serve, your confirmed services, the keywords you track, the time of year, and the details your crew entered when they uploaded a job photo. If you have a current offer on file it can write about that. If you don't, it won't make one up.
It rotates between kinds of post: a finished job, a spotlight on one service, something seasonal, a question customers often ask, a general update, and an offer when there is one. It won't queue two of the same kind together, and it's told not to repeat the topic or the opening line of a recent post.
Every post takes your least-used photo, if you've uploaded any, and a button such as Call or Learn more that points to your website. Drafts are written at ten in the morning your time, and never more than one post goes out on the same day.