Carney began his job this week, but has yet to post on the @PressSec account on the popular mini-blogging Internet site, The Hill reported.
White House communications director Dan Pfeiffer tweeted the news on Friday: "Jay Carney will officially take over the @PressSec account next week. He will start by taking your questions on Monday afternoon."
Carney's predecessor, Robert Gibbs, posted frequently on the @PressSec account, which has more than 150,000 followers.
Notable deaths of 2014 [PHOTOS]