Kensington Palace, the official residence of the Duke and Duchess of Cambridge, has launched its own Twitter feed.
Giving few clues of what to expect in the future, the palace tweeted:
Hello from Kensington Palace! Welcome to our new Twitter account.
This account represents The Duke and Duchess of Cambridge and Prince Harry - follow for updates on their work and the #RoyalFoundation
The new account joins @BritishMonarchy for news relating to Buckingham Palace and the Royal Family, and @ClarenceHouse representing the Prince of Wales and Duchess of Cornwall.
It gained almost 4,000 followers in its first half hour of existence.
The Duchess of Cambridge has apologised for not bringing Prince George to the Royal Family's traditional Christmas Day church service.
William and Kate joined the Queen, Duke of Edinburgh and others for the religious gathering near the private Sandringham estate in Norfolk.
After the service the Duchess apologised to a mother and her young daughter, who were among 2,000 wellwishers outside the church, for not bringing her son. When Maddison Neal, aged eight from nearby Dersingham, gave Kate a Milky Bar selection box for George, she replied: "I'm sorry we didn't bring George but you would have heard him in the church."
Maddison's mother Sarah, 37, said: "We were hoping Kate would take the present but we didn't know if we'd be lucky enough to meet her. "Maddison met George on Sunday at the service at Anmer church. She helped him with his lantern and he blew her a kiss."
The Duke of Cambridge paid tribute to his former univeristy in New York, saying that, "St Andrew's blend of academic excellence, mixed with a liberal approach to critical thought and creative reasoning, is one that both our nations, on both sides of the Atlantic, credit with importance."
Prince William was giving a speech at a benefit for the Scottish university at the Metropolitan Museum of Art in New York, which attended with the Duchess of Cambridge, the pair met while studying at St Andrew's.
The Duke and Duchess of Cambridge have joined fellow alumni of St Andrew's University at an event in New York.
Prince William made a solo visit to the Empire State Building as part of his three-day New York trip.
Wearing only a suit, the cold did not appear to bother the Duke of Cambridge as he was shown the view.
As the royal couple arrived two days ago the top of the building was lit up in red, white and blue to signify the colours of the British flag.
William and Kate's visit to the 9/11 memorial in New York has made headlines around the world, helping keep the memory of that tragic day alive.
Nearly 3,000 people, including 67 Britons, lost their lives in the attacks 13 years ago.
ITV's Royal Correspondent Tim Ewart reports:
The Duke and Duchess of Cambridge visited the newly built One World Trade Center after their visit to the 9/11 memorial.
The tower, which at 1,792 ft is the tallest building in America, opened this year replacing the twin towers which were demolished in the 9/11 attacks 13 years ago.
William and Kate also visited youth development centre, The Door. to meet young people who have benefited from their training programmes.
The Duchess of Cambridge said she was "moved" by her visit to the 9/11 memorial and being able to touch the names of those who died.
Kate, who signed her name alongside William's in a book of condolence, told the museum's chief of staff Allison Blais she was in awe of how big the museum was.
The memorial is for the 2,983 victims from 90 countries who died in the attacks 13 years ago.
The Duke of Cambridge was seen getting on a flight at LaGuardia Airport in New York heading to Washington.Read the full story ›
The Duke and Duchess of Cambridge are pictured inside the 9/11 memorial museum, which opened to the public in May this year.
The attacks claimed the lives of 2,606 people in New York and 2,983 in total. The museum features photographs of the victims and various artifacts from that fateful day.