The Queen has sent her first tweet during a visit to the Science Museum in London.
Her Majesty formally opened the museum's new Information Age Galleries by touching a tablet screen to send her message around the world.
The 88-year-old monarch tweeted through the @BritishMonarchy Twitter account, which was set up in 2009 and has 722,000 followers.
She posted: "It is a pleasure to open the Information Age exhibition today at the @ScienceMuseum and I hope people will enjoy visiting. Elizabeth R."
The message was pre-typed, before the Queen published it to Twitter by touching the screen in front of an audience at the event.