How do I prepare a useful brief for social?

One page is enough: who you serve, what you do not want shown, and what should happen at the end, a message or a booking. A ten-page document does not get read by the team between two services. Include hours, neighbourhood, three examples you like, and three you do not want repeated. The paper talks about values and never says who answers WhatsApp or which dish is this week’s. The page carries the audience, the limits, the examples, and the result each piece should ask for.