Zapier Push Integration
I used to use Deal Machine, and one of my favorite uses for zapier integration was alerting my Deal Finder facebook group about a new property that another deal finder just added. It kept them thinking about other people finding properties, and it dramatically increased the number of properties submitted.
I would have a pic of the property, and a message like "Jane Smith just submitted another property in Tacoma. The owner lives in Seattle. Keep them coming Jane!"