Happy tenth birthday Twitter.
The very first tweet was sent on this day back in 2006 and unleashed a new generation of microblogging, which has spanned the sacred, the profane, the important and - mostly - the utterly inconsequential. Hey, it's not called Twitter - dictionary definition "to give a call consisting of repeated light tremulous sounds" - for nothing.
Despite only having 140 characters to play with, some tweets have gone down in history, almost certainly destined to be looked upon by future alien invaders with the same sense of wonder that we study the Dead Sea scrolls. Maybe.
Here's our pick of the 20 tweets that changed the world (some more than others).