Social Media Using Foursquare, Ritz-Carlton takes its concierge service mobile People who have never been to a Ritz-Carlton hotel can now get advice from the luxury hotel chain’s travel experts using Foursquare’s ‘tips’ function. By Matt WilsonJuly 1, 2011 SHARE To read the full story, log in. Become a Ragan Insider member to read this article and all other archived content. Sign up today Already a member? Log in here. Learn more about Ragan Insider.