London (CNN) Social media has a new influencer: Britain's Queen Elizabeth II.

The Queen published her first post on Instagram on Thursday during a visit to London's Science Museum -- 43 years after she sent her first email

Rather than opting for the always-popular selfie as her inaugural update, she shared a letter sent by 19th-century mathematician and computer pioneer Charles Babbage to Queen Victoria's husband, Prince Albert.

"Today, as I visit the Science Museum I was interested to discover a letter from the Royal Archives, written in 1843 to my great-great-grandfather Prince Albert," she wrote in the post on the official @TheRoyalFamily account, using a touch screen iPad at the museum to send the message.

"Today, I had the pleasure of learning about children's computer coding initiatives and it seems fitting to me that I publish this Instagram post, at the Science Museum which has long championed technology, innovation and inspired the next generation of inventors," she added to the account's 4.6 million followers.