WASHINGTON -- Policymakers with the National Association of Realtors continue to grapple with proposed rules that would allow brokers and agents to distribute Internet Data Exchange (IDX) listings to mobile devices and social networking sites like Facebook.A work group formed by NAR to study the issue has twice recommended that NAR's IDX policy be amended to allow the "electronic display" of IDX listings in places other than broker and agent IDX sites.NAR's Multiple Listing Issues and Policies Committee, which reviews proposed rule changes before sending them to NAR's board of directors for consideration, balked at endorsing the work group's recommendations in November. The committee declined again on Thursday to act on the work group's latest recommendations, contained in a Marc...