As Twitter celebrates its tenth birthday today, we bring you ten quick facts about the social network: 1. Most retweeted tweet: @TheEllenShow's Oscars selfie Oscars host Ellen Degeneres sent the web into a storm when she snapped a photo featuring some top celebrities during the 2014 Academy Awards.2. Most followed: @KatyPerry (84 million followers) 3. Most followed Arab leader - @HHShkMohd (https://twitter.com/HHShkMohd) His Highness Sheikh Mohammed bin Rashid Al Maktoum, Vice President and Prime Minister of UAE and Ruler of Dubai, is the only Arab ruler to feature in the list of most followed leaders on Twitter, coming in fourth with 5.85 million followers. US President Barack Obama (https://twitter.com/POTUS) tops the list with 6.82 million followers. 4. Most mentioned: @JustinBieber (943 million @mentions) 5. Most tweeted emoji - Tears of Joy (4.9 billion emojis) 6. Most tweeted hashtag: #FF which stands for Follow Friday (539 million mentions) 7. Total likes - 250 billion 8. Tweets per minute event record: 618,725 tweets per minute, when Germany defeated Argentina in the #WorldCupFinal on July 13, 2014. 9. Fastest to reach 1 million followers - @CaitlynJenner 4 hours 3 minutes 10. Most geo-tagged city - Sao Paulo (638 million tags)