Mr Obama's 502,000 followers received an eagerly-awaited update on Wednesday – but those hoping for an insight into his personal life were left disappointed, as the focus was on the gloomy economic climate.
"Question about the economy? Ask President Obama", the post read. It included a link to the White House website , which features a new video message from the US 'Commander In Chief'.
"One of my priorities as President is opening up the White House to the American people, so that folks can understand what we're up to, and participate themselves", he said.
"We're going to take advantage of the internet and bring all of you to the Whitehouse to talk about the economy. Anyone can submit a question about the economy, or vote on other questions. On Thursday I will be giving you some answers myself."
Admitting that he and the public "may not always agree on everything", the President promised to give the electorate "some straight answers" and address their concerns.
A host of famous figures use Twitter to communicate with their supporters.
Lily Allen, Stephen Fry, William Shatner, David Lynch, Jordan and Mariah Carey are all devotees of the social messaging utility, which enables users to post real-time updates on the minutiae of their lives.
President-elect Barack Obama speaks at inaugural concert
watch performances from the concert
Thousands gather Sunday afternoon on the National Mall in Washington.
Inauguration revelry began Sunday afternoon as thousands of people packed the National Mall in Washington for a free concert featuring big stars.
President-elect Barack Obama addressed a roaring crowd after 90 minutes of high-energy acts such as U2, Mary J. Blige, Usher and Beyonce.
"Welcome to this celebration of American renewal," he said.
"In the course of our history, only a handful of generations have been asked to confront challenges as serious as the ones we face right now."
"I stand here today as hopeful as ever that the United States of America will endure," Obama said. "That it will prevail; that the dream of our founders will live on in our time."
Obama spent the morning visiting Arlington National Cemetery and attending church before heading to the "We are One: Opening Inaugural Celebration" at the Lincoln Memorial. It was nothing but good vibes -- a brief respite for an incoming president who will face huge problems after he takes office Tuesday.
Bruce Springsteen opened the concert with his song "The Rising," singing, "How far I've gone/How high I've climbed/On my back's a 60 pound stone/On my shoulder a half mile line."
Along the National Mall, between the Capitol and the Washington Monument, people watched the concert on massive screens and sang along with "America the Beautiful" and "This Land is Your Land."
During U2's performance of "Pride (In the Name of Love)," a tribute to the Rev. Martin Luther King Jr., frontman Bono referenced the civil rights leader's "I Have a Dream" speech, saying that it was also, "an Irish dream, a European dream, and African dream, an Israeli dream, and a Palestinian dream." read more
