In a New Year's Day message 19 days before handing the reins to his successor Donald Trump, US President Barack Obama says the presidency has been a "privilege".
"It's been the privilege of my life to serve as your President. I look forward to standing with you as a citizen. Happy New Year everybody," he wrote on Twitter.
Obama used the social media network for a multimedia recap of the achievements of his nearly eight years as president, from health insurance reform and same- sex marriage equality to the fight against climate change and growth in the renewable energy sector.
"We traded foreign oil for clean energy, we doubled fuel efficiency standards, & we acted on a global scale to save the one planet we've got," he wrote.