Zillow has an agreement with one of the biggest MLSs in the nation that helps secure the timely flow of listings to the site by bypassing a syndicator owned by rival realtor.com's parent company. Brokers who belong to My Florida Regional MLS, which serves more than 39,000 members across central and southwest Florida, now have the option of sending their listing data directly to Zillow as often as 15 minutes, ensuring that information that appears on the site is in sync with MLS data.