Evening top 5: Donald Trump's inauguration; White House petition; and dangerous emojis

The top stories this Friday night

Donald Trump is sworn in as President of the United States

Donald Trump has pledged a "great national effort" to rebuild America after being sworn in as the 45th President of the United States.

The 70-year-old billionaire took the oath of office on the west steps of the US Capitol in Washington and brought the curtain down on the presidency of Barack Obama.

In his inaugural address, Mr Trump promised to transfer power from Washington to the people, and pledged a "great national effort" to rebuild the country.

Thousands have already signed the first official petition for the new White House

Only a few hours in office and US President Donald Trump is already looking at papers piling up on his desk.

The official White House petition page has its first entry on the same day President Trump was sworn in.

It is asking for the president to "immediately release" his full tax returns.

In Pictures: The Obama's bid farewell to the White House

It has been a home for Barack Obama and his family for the last eight years.

But he, his wife Michelle and their two daughters have closed the door of the White House for the last time, as Donald Trump takes office.

While Mr Obama's official White House photographer, Pete Souza, has also captured some tender moments.

Ireland and Leinster's Sean O'Brien reveals how he has changed his game to avoid injuries

Sean O'Brien says the rise of other big ball carriers and his own conscious decision to alter his style have modified the way he plays rugby.

The Leinster and Ireland flanker has suffered injury setbacks during his career but as he told Off The Ball and former provincial and international team-mate Brian O'Driscoll, he has made changes to elements of his game that can reduce the number of collisions and resulting injuries he sustains

Don't do this: The three emoji message that can crash your iPhone

A hacker has identified a combination that can temporarily disable iPhones. It goes without saying that you should not try this yourself.

The combination consists of a white flag emoji, a "0" and a rainbow emoji.

Upon receiving the message, the iPhones freeze for around a minute and users are forced to restarted.