The Queen has passed a technological milestone - sending the first royal tweet under her own name to declare a new Science Museum gallery open.
Normally a plaque is unveiled to herald the launch of a new project, but after touring the attraction dedicated to the history of communication and information the Queen touched a tablet screen to send her message to the world.
The £15.6m gallery features more than 800 objects and explores how breakthroughs have transformed the way people communicate over the past 200 years.
The royal tweet read: "It is a pleasure to open the Information Age exhibition today at the @ScienceMuseum and I hope people will enjoy visiting. Elizabeth R."
The Queen's message was sent via the official @BritishMonarchy Twitter account and is likely to be re-tweeted thousands of times by many of its 722,000 followers.
During her reign the Queen has encountered a rapidly-changing world of technology from the advent of the colour television to the mobile phone and the internet.
Television cameras were allowed inside Westminster Abbey in 1953 to film her coronation. Five years later she made the first trunk call in the UK, and when email technology was in its infancy, she became the first monarch to send one of the messages.
The Queen and members of her family are represented on Twitter by the account @BritishMonarchy, while @ClarenceHouse covers the Prince of Wales, Duchess of Cornwall, Duke and Duchess of Cambridge and Prince Harry.