How do you coordinate social posts with email and WhatsApp?

The same offer goes out the same day on the feed, by email and on WhatsApp, with the same end date. Sending the email on Monday fails if the story promised the terrace for Sunday only and Monday is already wet in the sierra. You need a list of people who have actually eaten there, and someone who can send the WhatsApp during the shift. Three channels quote three prices for the same menu because each was written on a different day. Carlota Fermín leaves a one-line note per channel: copy, send time and the moment the offer dies.