The British monarchy has had a Twitter account since April 2009, but it wasn't till today that Queen Elizabeth II sent her first tweet.
The @BritishMonarchy account then sent a follow-up tweet to its 700,000+ followers to confirm that she did actually tweet it herself.
And then tweeted a picture of her actually using her royal hands to type it at the Science Museum in London this morning.
This man, Chi, was "in charge" of the iPad she used to tweet – leading some to conclude that the monarch just pressed "send" on the tweet rather than typing it herself.
Within 45 minutes the tweet had almost 4,000 RTs.
It's not the first time the royal family has used Twitter – Prince Charles used the @ClarenceHouse account to announce the arrival of Prince George last summer.
And Prince Harry sent his first earlier this year to promote the Invictus Games.
The queen has always been keen to be seen using new technology – she was the first monarch to send an email, way back in 1976.
And she appeared (accidentally) in this tweeted selfie at the Commonwealth Games in Glasgow.
But of course, because this is Twitter, it took precisely NO TIME for people to start with the jokes.
Even the presence of the head of state can't tame Twitter's satirical bent.
But while a lot of people have no time for the monarchy, a huge number of people on Twitter really, really like the Queen.
There was then the crushing realisation that now the Queen is tweeting, Twitter may well be over.
There were predictably depressing attempts from social media managers of high street brands to piggyback on the news.
John Prescott offered some (rather partisan) advice for the politically neutral monarch.
Other subjects wanted to know the answers to the really big questions.
Some just wanted a RT.
Or a selfie.
People were pretending to retweet entirely made-up tweets, such as this one: