That application is not only a productivity tool that allows our real estate customers to manage their workflow of contacts and new leads from consumers shopping for homes on Trulia, but also a promotional vehicle for them to show off their local knowledge and stand out to consumers via our check-in feature.

FORBES: Trulia: Here's How to Monetize Mobile

Another feature to check into is whether or not data can flow both ways.

FORBES: A Five-Point Checklist For CIOs Looking For A Mobile App

For location check-ins, Facebook will feature a large map of destinations.

WSJ: Facebook Unveils Sweeping Changes to News Feed