Washington - When President Barack Obama called on world leaders at the United Nations to do more for the world's refugees, his mention of a young boy named Alex could have just been a footnote...a forgotten paragraph in a daily blizzard of speeches and media releases.The White House had other plans. Social media gurus at the White House built on the president's remarks by sending a video crew to Alex's home in New York. They recorded an adorable Alex reading aloud a letter he had written. Alex asked the president to bring to his house a 5-year-old bloodied boy the world had seen sitting in an ambulance in Aleppo, Syria. He promised: "We will give him a family, and he will be our brother."When the White House posted the video on the president's Facebook page it was watched 27 million times. It also generated a wave of stories in media outlets around the country - drawing attention to the boy's compassion and, by association, Obama's desire to persuade the United States and the rest of the world to embrace more Syrian refugees.Shape his legacyThe Alex video demonstrated how the Obama administration has increasingly turned to a new menu of options to engage the public. The first American president of the social media age, Obama has for years been breaking ground on how politicians connect with a digitally savvy electorate. He has used social media as a tool to educate, to amuse, to spin, and, undoubtedly, to shape his legacy. And judging by his successor's Twitter account, it's one of the few legacies he's leaving that President-elect Donald Trump has embraced.The year Obama came into office, the White House joined Facebook, Twitter, Flickr, Vimeo, iTunes and MySpace. In 2013, the first lady posted her first photo to Instagram. In 2015, President Obama sent his first tweet from @POTUS, an account which now has 11 million followers. This year, the White House posted its first official story on Snapchat, a promotion of the president's State of the Union address.White House officials said the focus on social media is simply a strategy of going to where people get their news. It's an add-on, not a replacement, they said, for media conferences and interviews with journalists. They said presidents, with very rare exceptions, can no longer rely on a single method for communicating their message."The biggest lesson that we've learned is that the bully pulpit is dead," White House Communications Director Jen Psaki said. "So we have a responsibility as a government and as his staff to come up with a range of ways and levers to communicate information."The Pew Research Centre recently found that about 4 in 10 Americans often get their news online. Digital is second only to TV news as the most prominent news platform. Younger adults are especially likely to turn to the web for their news.Matthew Hindman, an associate professor at George Washington University, said presidents are increasingly closed off from the media and Obama is no exception. Social media allows the Obama administration not to be "hostage" to what the media is focused on during a particular day, he said."What this is about is getting their message out to their supporters, energising the base, getting support for their policies and to some extent shaping the agenda by forcing coverage of issues they think are important," Hindman said.Wasn't up to speedThe American Presidency Project said Obama has held about 21 individual and joint media conferences a year during his presidency, fewer than his three predecessors. George HW Bush held about 34 a year, Bill Clinton averaged about 24 media conferences annually and George W Bush, 26. Ronald Reagan, given the moniker the "great communicator," held about six a year.Obama jokes about his social media skills, saying his cellphone doesn't allow him to make or receive calls and he can't text or take pictures. Basically, he can only use his phone to look at the internet and send emails."I now have an iPhone, but it is, you know, like, the phone you give your 2-year-old, where they can pretend to press things, but nothing actually happens?" Obama said on Jimmy Kimmel Live.Obama said in a recent interview for Snapchat's political show, Good Luck America that he wasn't up to speed on every aspect of social media when he ran for president."But I hired a bunch of 25- and 26-year-olds who were all into it," Obama said.