10 unforgettable Twitter moments

Twitter co-founder and CEO Jack Dorsey, or simply @jack, posted the very first tweet on March 21, 2006: "just setting up my twttr." Many more users on the microblogging platform would start out with a similar message, but his got tens of thousands of retweets.

American television host Ellen DeGeneres posted this snapshot during the Oscars 2014, which she called the "best photo ever," and an incredible number of people agreed. With over 3 million retweets and a bunch of famous actors in the picture, this selfie is the most successful tweet of all time.

This catchphrase became a huge viral hit recently: Some people are even getting "Damn Daniel" tattoos now. Two Californian teens, Daniel Lara (l.) and Josh Holz, posted a 30-second video where Josh praises his best friend's clothes, repeating "Damn Daniel." It earned the young Internet stars a lifetime supply of sneakers - they made headlines again by donating them to young patients in hospitals.

Goofy entertainment works well on Twitter, but countless tweets react to serious current events as well. During the Arab Spring, #Egypt was used on Twitter by locals and journalists reporting about the fall of the Egyptian regime. In 2011, longtime President Hosni Mubarak resigned as a result of the Egyptian revolution. Journalists worldwide also fetched their information on Twitter.

On January 7, 2015, two Islamist militants forced their way into the offices of the French satirical magazine "Charlie Hebdo," killing 11 people and injuring 11 more. The hashtag #jesuischarlie was used on Twitter to express compassion with the victims of the massacre. A few weeks after the attacks, the hashtag had already appeared five million times on Twitter.

In the German tweetosphere, the hashtag #aufschrei (which translates as outcry) was picked up by many Twitter users in 2013 to share sexist and misogynist experiences. It has become a symbol for feminism, but is now also used to denounce different forms of injustice.

After winning the 2014 FIFA World Cup in Brazil, German star players Lukas Podolski and Bastian Schweinsteiger posted this winning selfie directly from the field. Not only did the dream team win the FIFA World Cup, they also earned 80,000 retweets with this tweet. Which achievement makes them prouder?

The first son of Prince William and his wife Catherine was born on July 22, 2013. Breaking with the tradition of posting the announcement outside Buckingham Palace first, the birth of Royal Baby George was made public via Twitter, stating, "Her Royal Highness The Duchess of Cambridge was safely delivered of a son at 4.24pm." A similar tweet was posted when Baby Charlotte came in 2015.

The US president posted this picture of him hugging his wife Michelle after being re-elected for his second term of presidency in November 2012. Retweeted nearly 800,000 times, this is one of the most successful tweets ever, reflecting Obama's popularity on social media.

Some of the most successful tweets are quite simple, fitting Twitter's 140-character limit. In 2011, this even shorter motivational message went viral: "Never be afraid to dream." Certainly contributing to its popularity was the person who wrote it: Stefani Germanotta, aka megastar Lady Gaga.