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.

Pope Francis poses for a selfie with a mother and her child Saturday, November 8, in Vatican City.

Actress Jennifer Lawrence, right, poses with fan Chelsea Boyce at the release of the latest "Hunger Games" movie Monday, November 17, in Los Angeles.

Actor James Franco snaps a selfie with host Jimmy Fallon on a "Tonight Show" episode Monday, July 28.

"Got a chemical peel to look more sexier," tweeted comedian Roseanne Barr on Tuesday, November 25. "Joked about tussling Cosby."

Comedian Bob Saget, right, posted a selfie with his former "Full House" co-star John Stamos on Saturday, June 28. "Sunset Stamos selfie," he wrote on Instagram.

Rapper Wiz Khalifa tweeted this "jail selfie" on Sunday, May 25. According to TMZ, he was arrested at a Texas airport after a "green leafy substance" was found during a security check. MTV reported that he was released after a few hours and charged with being in possession of 0.5 grams of marijuana.

London Mayor Boris Johnson, third from left, and British Prime Minister David Cameron, third from right, take selfies with locals as they campaign in London on Monday, May 12. Cameron told the London Evening Standard that the selfie craze these days makes campaigning take longer. "You can be walking down the street for a chat, but until you've got the selfie out of the way people aren't ready to talk," he said.

Guests dressed in period costumes pose for a selfie Saturday, June 28, at a ball held in the gardens of the Palace of Versailles in Versailles, France.

Television host Ellen DeGeneres dumps a bucket of ice water on Kim Kardashian during an episode of "Ellen" that aired Tuesday, September 9. It was part of the ALS Ice Bucket Challenge, a social media campaign that has been raising awareness and money to fight Lou Gehrig's disease, which is also called amyotrophic lateral sclerosis or ALS.

Giancarlo Stanton, an All-Star baseball player with the Miami Marlins, posted photos of himself after a pitch hit him in the face Thursday, September 11, in Milwaukee. "Making huge progress!!" he wrote on Instagram. "Want to thank everyone who has played a part in my recovery process. Your kind messages, thoughts & prayers have meant the world to me."

A group of women takes selfies with actor Tom Cruise on Thursday, July 31 -- Ladies Day at the Goodwood horse races in Chichester, England.

Tourists take a selfie as demonstrators burn a trash container during a May Day rally in Barcelona, Spain, on Thursday, May 1. May Day is also known as International Workers' Day, and tens of thousands of workers in European cities marked the occasion with a mix of anger and gloom over austerity measures meant to contain the eurozone debt crisis.

A tomato is about to hit two women as they take a selfie during a tomato fight in front of the Royal Palace in Amsterdam, Netherlands, on Sunday, September 14. The event was marketed as a protest of Russia's boycott of European produce.

Boston Red Sox pitcher Joe Kelly, right, snaps a selfie with retiring New York Yankees captain Derek Jeter before Jeter played the final game of his career Sunday, September 28, in Boston. Kelly tweeted the photo with the hashtags #RE2PECT and #2ELFIE in honor of Jeter's jersey number. See photos from Jeter's 20-year career

Michael Jordan, basketball legend and principal owner of the NBA's Charlotte Hornets, snapped a selfie Tuesday, October 28, to confirm that he was taking over the team's Twitter account for the day. "Yes, it's really me doing this #MJTakeover," he wrote.

"Is this what Beyonce was singing about?" asked actress Lena Dunham in this early morning selfie posted to Instagram on Friday, August 29. She was referring to the "I woke up like this" line from Beyonce's song "Flawless."

Television personality George Kourounis takes a selfie at Ambrym, a volcanic island in Vanuatu, on Wednesday, August 27. "Volcano #selfie. When normal selfies are not extreme enough!" he tweeted.

Actress Portia de Rossi, left, tweeted this beach selfie of her and her wife, talk show host Ellen DeGeneres, on Saturday, November 29. They were celebrating 10 years together as a couple.

Two of the world's biggest pop stars -- Katy Perry, left, and Adele -- appear in a selfie that was posted to Perry's Instagram account on Wednesday, May 28. It was taken while Perry was in London for her Prismatic World Tour. "...And on the 2nd LDN show the Queen graced me with her presence," Perry wrote.

Actress Angelina Jolie tries to take pictures with fans as she attends the Tokyo premiere of her movie "Maleficent" on Monday, June 23. See the life of Angelina Jolie

Women take a selfie as they attend a soccer match in Al Ain, Saudi Arabia, on Tuesday, September 30.

A woman takes a selfie in front of army soldiers standing guard in Bangkok, Thailand, on Tuesday, May 20. A couple of days later, Thailand's military declared it had taken control of the country in a coup.

German actor Julian Stoeckel takes a selfie with Austrian singer Conchita Wurst, right, during a gala in Berlin on Friday, June 20. Wurst, the onstage drag persona of Thomas Neuwirth, won this year's Eurovision Song Contest.

A woman poses for a selfie between two soldiers in Beijing on Wednesday, October 1. It was China's National Day, a holiday that marks the republic's founding.

U.S. Secretary of State John Kerry takes a selfie with a group of students in Jakarta, Indonesia, before delivering a speech on climate change on Sunday, February 16.

People walk around a partially inflated hot-air balloon Sunday, July 27, at the New Jersey Festival of Ballooning in Readington, New Jersey.

Aaron Schneider, an Iraq War veteran, snapped this shot after he rescued a beagle that he saw get hit by a car on Interstate 470 in Lee's Summit, Missouri. Schneider crossed several lanes of traffic to get the dog to safety, and he later took it to get medical care, according to KMBC. The dog was expected to recover from its injuries.

A visitor lies down to take a selfie on the new glass floor of Paris' Eiffel Tower on Friday, October 3. The transparent walkway offers dramatic views 187 feet in the air.

A woman takes a selfie in Washington as a helicopter carrying U.S. President Barack Obama takes off from the White House on Thursday, June 26.

Jennifer Atkins and Susan Justin take a selfie before a mass wedding was held in Toronto on Thursday, June 26.

At the Country Music Awards on Wednesday, November 5, singer Brad Paisley announced the sex of Carrie Underwood's baby. It appears Underwood and her husband, hockey player Mike Fisher, are having a boy. Later that night, Paisley, right, tweeted this selfie with Garth Brooks. "Wanna see my Garth selfie just before I let the cat out of the bag?" he asked. "Lil' Garth Fisher. Just sayin'!"