How do you measure whether social posts bring people through the door?

You measure it by asking on the floor and on WhatsApp which piece they saw, then matching that to the day's bookings, not to likes. Calling a reel a success because another city watched it fails if those people cannot sit down. The booking book needs a source column, even a single letter, written by the person who seats the guest. The report boasts about reach and Thursday's room is empty, and nobody asked where Saturday's full service came from. Each month the pieces sit next to the tables the floor marked as coming from Instagram or WhatsApp, with the day beside them.