How BLM went from Facebook post to global movement

A slogan chanted by tens of thousands around the world, Black Lives Matter has sparked a hashtag, a network of grass-roots organisations, and a moral collective of activists.
But how did it go from a social media post to a global phenomenon, and where does it go now?
The names most associated with Black Lives Matter are not its leaders but the victims who have drawn attention to the massive issues of racism this country grapples with: George Floyd, Breonna Taylor, Eric Garner, Michael Brown, to name a few.
The movement can be traced back to 2013, after the acquittal of George Zimmerman, who shot and killed Trayvon Martin in Florida.
The 17-year-old had been returning from a shop after buying sweets and iced tea. Mr Zimmerman claimed the unarmed black teenager had looked suspicious.
There was outrage when he was found not guilty of murder, and a Facebook post entitled "Black Lives Matter" captured a mood and sparked action.