E-commerce and boutiques. The "how much?" under a post gets a public answer and a DM with the product, while spam clears itself out of the comments.
Restaurants and cafés. Reservation questions, the menu and opening hours answered on the spot, and story replies to a promotion turning into real enquiries.
Beauty, health and clinics. Booking requests collected with the service and price explained, and anything that needs judgement passed to a person.
Real estate and automotive. Ad traffic welcomed, budget and preference collected, and only the qualified enquiries reaching the sales team.
Education and courses. Programme, date and price questions answered, and enrolment details collected in the conversation, in whichever language they asked.
Agencies and consultancies. Incoming requests screened before they take up anyone's time, with the right ones pointed at a calendar.