When it comes to Irish media agencies with declared Twitter followers, Mediaworks tops the list by some distance. A study by Mediaworks director Fiona Field (pictured), found that the Core Media agency is by far the most active on Twitter with 4,002 followers. Group M’s Mindshare is in second place with 1,910, followed by MediaVest on 1,224; Vizeum, 1,189; Starcom, 976; Carat, 964, OMD, 744; Zenith, 450 and PHD on 242.