The CIA joined Twitter on Friday and proved it has a sense of humor with its first tweet. Check out other famous first tweets on one of the world's largest social networks:
Investor and philanthropist Warren Buffett sent his first tweet during an interview with Fortune. He said his first tweet has some meaning: "It means my family can no longer say I'm lodged back in the 19th century."
Former President Bill Clinton sent his first tweet with the help of comedian Stephen Colbert.
Prolific tweeter Ashton Kutcher became the first person to get 1 million followers on Twitter.
Oprah Winfrey launched her Twitter account the same day Twitter Chief Executive Evan Williams and famous tweeter Ashton Kutcher joined her on her show.
Singer Justin Bieber's first tweets directed fans to his other social media accounts. In this case, MySpace.
"Dear friends, I am pleased to get in touch with you through Twitter. Thank you for your generous response. I bless all of you from my heart."
Pope Benedict XVI started the Vatican’s Twitter account, @Pontifex, on Dec. 12, 2012. He resigned a few months later and deleted all of his tweets, but left the Twitter account open for his successor to use.
Pope Francis did decide to continue the Twitter account.
The pope got a lot of attention for joining Twitter, but he wasn't the first world-famous religious figure to send a tweet. The Dalai Lama started tweeting in February 2010.
Lady Gaga is known as a prolific tweeter. At one time, she was the most-followed person on the site.
This was not astronaut TJ Creamer's first tweet, but it was the first tweet sent from space.
Back when Twitter co-founder Jack Dorsey sent his first tweet, the site was called Twttr. No vowels allowed.
Comedian Conan O'Brien joined Twitter after being fired from his job as host at "The Tonight Show." As part of his severance agreement, he couldn't appear on television six months.
President Barack Obama sent his first tweet while a U.S. senator gearing up for his first run for the White House.
Actor Charlie Sheen joined Twitter while in the middle of a very public breakdown that included getting fired from his hit show "Two and a Half Men."
Jordan's Queen Rania is known for her advocacy work, and she's taken it to Twitter.
Actor Neil Patrick Harris is one of many actors to interject some comedy into his first tweet.
Philanthropist Bill Gates highlighted his work when he first joined Twitter.
Bill Cosby wanted to be sure followers knew just whose tweets were appearing on his account.
Actor Tom Hanks apparently mistook his Twitter account for a microphone.
Beyonce has not used her Twitter account much, but she has gained a lot of followers.