Firstly, let us say that the photo above is something of a cheat. For Barack Obama didn't send his first tweet from @POTUS via a laptop on a lectern. He did it in the time-honoured fashion - perching casually on his desk in the Oval Office:
Yes, President Obama has a brand new Twitter account.
And after we'd all had a good giggle at his exchange with Bill Clinton...
...it was time to have a giggle at other Twitter users' reactions to this momentous event. Which was, indeed, momentous:
Tweeters' responses included advice for the President:
Advice for fellow tweeters:
And some contemplation on how Joe Biden might be feeling:
Poor Joe Biden...
And that wasn't all. The official White House photo of the official moment of the official first tweet also prompted some marvellous picture captions from our Twitter followers:
Including the favourite Twitter running joke that is Cheggers:
And, not forgetting:
Marvellous. Welcome to the wonderful world of Twitter, @POTUS!