Advertising and communication services provider WPP plc ( WPPGY ) reported strong results for the full year 2013 with double-digit earnings and mid single-digit revenue growth year over year. Earnings per share for 2013 improved 10.8% year over year to 69.6 pence ($1.09) on the back of revenue growth across all geographic regions and strong performances from every operating segment except Public Relations and Public Affairs.