In the three years that Chapin Clark, R/GA's's exec VP-managing director of copywriting, has been manning the agency's Twitter feed it has attracted 40,000 followers who enjoy his clever, sarcastic commentary on the news, advertising and media.

Case in point is a tweet he fired off recently, posted with a link to a Gawker story: "Lindsay Lohan set to play Liz Taylor in Lifetime movie. Still no word on who will play the young Liz Taylor."

As successful as he's been at getting a following, and as much time as he devotes to maintaining that audience and engaging with them daily, Mr. Clark, 42, has a much bigger role to play at the Interpublic Group of Cos.' digital shop, where his main duty is managing a copy department of 70 writers.