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Evolution of a presidential selfie

(From top L) Denmark's Prime Minister Helle Thorning Schmidt, US President Barack Obama and US First Lady Michelle Obama attend for the memorial service of South African former president Nelson Mandela at the FNB Stadium (Soccer City) in Johannesburg on December 10, 2013. Mandela, the revered icon of the anti-apartheid struggle in South Africa and one of the towering political figures of the 20th century, died in Johannesburg on December 5 at age 95. AFP PHOTO / ALEXANDER JOEALEXANDER JOE/AFP/Getty Images ORG XMIT: 455215463
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