Restaurants need a low cost system to reach out to their customer base to bring them through the door. First we had email, but emails are becoming less and less effective due to decreased opening rates. Then, we moved to text message marketing, this works great with over a 90% opening rate, but you have to pay for each text you send out so the more your customer base grows so does your cost. Today my recommendation is Facebook Messenger. With new tools such as https://manychat.com you can store a database of interested customers, communicate with them at an 80%+ opening rate all for FREE!