Twitter declares 2014 year of the selfie

Host Ellen DeGeneres takes a moment to orchestrate a selfie with a group of movie stars at the Academy Awards ceremony on Sunday, March 2. Actor Bradley Cooper, seen in the foreground, was holding the phone at the time. "If only Bradley's arm was longer," DeGeneres tweeted. "Best photo ever." It became the most retweeted post of all time.

A boy in Belfast, Northern Ireland, takes a selfie in front of Britain's Queen Elizabeth II on Tuesday, June 24.

Pop star Lady Gaga and a four-legged friend take a photo together on Wednesday, July 9. "It's time to Party in Toronto," she wrote on Instagram. "I have had the BEST time here."

Actor LaVar Burton, bottom, snaps a selfie with other former "Star Trek" stars, including Sir Patrick Stewart and William Shatner, during an event in Chicago on Sunday, August 24.

Cyclist Alberto Contador gives a thumbs-up while fan Katie Holroyde takes a selfie Saturday, July 5, at the start of the Tour de France in Leeds, England. One of the Tour's charms has been allowing fans to get close to the action for free, but some cyclists this year have complained about fans taking selfies and not paying attention to the dangers they pose.

NASA released a selfie of the Mars rover Curiosity on Tuesday, June 24. The selfie, a composite of dozens of images captured in April and May, celebrated a full Martian year -- 687 days -- since the rover's touchdown on the Red Planet. See more photos of the Mars rover Curiosity

Actor Jon Hamm takes a selfie with his wax figure after it was unveiled Friday, May 9, at Madame Tussauds in New York.

Recording artists Demi Lovato, left, and Taylor Swift take a selfie at the MTV Video Music Awards on Sunday, August 24. Lovato posted the selfie to her Instagram account.

A man takes a selfie as Tioga Pass, ridden by Luke Morris, passes by him during a race at the Goodwood Racecourse near Chichester, England, on Friday, May 23.

Russian daredevils Alexander Remnev, left, and Volodya Sidorov take a selfie Thursday, January 30, after scaling the Princess Tower, a skyscraper in Dubai, United Arab Emirates.

German soccer player Lukas Podolski gets a kiss from teammate Bastian Schweinsteiger as they celebrate their World Cup victory Sunday, July 13, in Rio de Janeiro. Germany defeated Argentina 1-0 in extra time for the country's fourth World Cup title.

A protester takes a selfie in front of a burning car in Brussels, Belgium, on Thursday, November 6. Tens of thousands of demonstrators converged on the Belgian capital to protest government policies that would extend the pension age, contain wages and cut into public services.

Funnyman Stephen Colbert, left, takes a selfie with David Letterman on the "Late Show with David Letterman" on Tuesday, April 22. It was Colbert's first visit to the show since CBS announced Colbert would succeed Letterman when Letterman retires in 2015.

U.S. Vice President Joe Biden posted the first selfie to his new Instagram account on Wednesday, April 16 -- and it was with President Barack Obama. The White House Twitter account also posted the photo with a simple caption: "Pals." See more photos of the Obama-Biden partnership

Journalist Ernest Owens tweeted a selfie with actress Amy Adams on Friday, June 27. "Told @InsideEdition why Amy Adams was classy for giving up her 1st class seat to the soldier sitting next to me!" he wrote.

Actor Norman Reedus, right, posted a selfie with actor Chris Hemsworth on Tuesday, March 11.

Hossam Antikka and his friends, plus a camel, smile for a selfie in Giza, Egypt, on Wednesday, October 1.

Actress Michelle Rodriguez posted this photo of her and her "Fast and Furious" co-star Vin Diesel on Thursday, July 10. They just finished shooting the seventh movie in the successful film franchise. "Ride or Die through thick and thin 15 yrs later surreal to think we made it through such a tough painful production," she wrote on her Instagram account.

Three acid attack victims, Laxmi, Rupa and Ritu, take a selfie Friday, June 20, for the Stop Acid Attacks campaign: "Together we can eliminate this social evil. ... Help us succeed in our fight to end #AcidViolence in India."

A fan takes a selfie with "Grumpy Cat," the Internet celebrity famous for her perpetual scowl, on Friday, June 27, at the Anaheim Convention Center in Anaheim, California. The cat, whose real name is Tardar Sauce, is the official "spokescat" for Friskies cat food and its award show for the best original cat videos.

A worker takes a selfie before removing a Ukrainian flag that was attached by protesters atop a Stalin-era skyscraper in Moscow on Wednesday, August 20. Protesters scaled the skyscraper and painted the Soviet star in the national colors of Ukraine. The dangerous prank, which set Russian social networking sites abuzz, drew a harsh response from the police.

National Security Agency whistleblower Edward Snowden, left, poses for a photo with, from right, journalist Laura Poitras, journalist Glenn Greenwald and Greenwald's husband, David Michael Miranda. Miranda posted the selfie to his Facebook page on Thursday, May 22. Greenwald was the journalist who broke the Snowden story last year.

Alexander Gerst, an astronaut with the European Space Agency, takes a selfie during a spacewalk Thursday, October 9, outside the International Space Station.

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