The White House has tweeted this photo of US President Barack Obama with one of his daughters to celebrate Father's Day.
The Clinton Foundation followed suit by tweeting this photo of former US President Bill Clinton with daughter Chelsea.
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President Barack Obama has praised George W Bush at the dedication of the former president's library for showing strength and resolve in the days after the September 11 attacks and said if Congress passes immigration reform "it will be in large part thanks to the hard work" of his predecessor.
Mr Obama spoke along with all four living former presidents in a rare reunion honouring one of their own at the opening of the George W Bush Presidential Centre.
Mr Bush, the country's 43rd president, gave a closing speech with tears welling in his eyes."My deepest conviction, the guiding principle of the administration, is that the United States of America must strive to expand the reach of freedom," Mr Bush said.
"I believe that freedom is a gift from God and the hope of every human heart."
The former US President was signed up during an interview with comedian Stephen Colbert and so far has only sent one tweet:
The bio on the account, which has already amassed over 56,000 followers, appears to have been heavily influenced by Colbert: "I am President William Jefferson Billy Jeff Rodham Clinton. Stephen Colbert is my BFF." [Best Friend Forever]
The interview filmed on Saturday in St Louis for at the annual Clinton Global Initiative University and has since been promoting Clinton's new Twitter account:
Former US President Bill Clinton said: "I was saddened to learn of the death of Lady Margaret Thatcher. The United Kingdom has lost its first woman Prime Minister, an iconic stateswoman, and a fearless leader.
"The United States has lost one of its dearest friends and most valued allies.
"Lady Thatcher understood that the special relationship which has long united our two nations is an indispensable foundation for peace and prosperity. Our strong partnership today is part of her legacy.
"Like so many others, I respected the conviction and self-determination she displayed throughout her remarkable life as she broke barriers, defied expectations, and led her country.
"Hillary, Chelsea, and I extend our condolences to her family and to the people of the United Kingdom."
Oscar-winning director Martin Scorsese will produce and direct a documentary on former US President Bill Clinton, US network HBO has announced.
The man behind Hollywood blockbusters such as Goodfellas and The Departed, described Clinton as a "towering" and transcendent" figure.
Scorsese said: "A towering figure who remains a major voice in world issues, President Clinton continues to shape the political dialogue both here and around the world.
"Through intimate conversations, I hope to provide greater insight into this transcendent figure."
Clinton said he was pleased that the legendary director had agreed to direct the documentary.
He added: "I look forward to sharing my perspective on my years as president, and my work in the years since".
According to a campaign official, the first person President Obama called after receiving the concession call from Mitt Romney was Bill Clinton.
Former-President Clinton proved to be one of Obama's top surrogates and most valuable supporters during his campaign.
Bill Clinton has been to see Nelson Mandela on the eve of his 94th birthday.
The former US President paid tribute to his South African counterpart on a visit to Mandela's home village of Qunu.
Former US President Bill Clinton has planted a tree in Nelson Mandela's home village of Qunu in South Africa.
Mr Clinton is visiting the former South African president on the eve of his 94th birthday, marked around the world as International Mandela Day.
The former US President Bill Clinton has met Nelson Mandela at his home in the village of Qunu in South Africa ahead of his 94th birthday tomorrow.
Mr Mandela's grandson Mbuso has tweeted a picture of the encounter: