The added exposure gives up to four times more views than Trulia property listings without check-ins, said Heather Fernandez, Trulia’s vice president of agent services.

Trulia first released a mobile app for agents for the iPhone that featured property check-ins and lead notifications in December, 2011.

The following August, Listing syndicator ListHub instituted a policy restricting the use of listings in agent tools, including mobile apps designed for real estate agents by Trulia and others.

The change was required under the terms of a new syndication agreement between Trulia and ListHub’s parent company, Realtor.com operator Move Inc.

Although ListHub is the largest syndicator of listings data to third-party sites like Zillow and Trulia, those sites can also get listings directly from multiple listing services and brokers.