African-American poet Amanda Gorman, who became a star after reading at US President Joe Biden's inauguration, called out a security guard for following her home.
She revealed how the security guard approached her – and then in another tweet said that she is was a “threat to injustice”.
"This is the reality of black girls: One day you're called an icon, the next day, a threat," she tweeted on Friday.
The Harvard University graduate was invited to perform in Washington after First Lady Jill Biden saw one of her readings.
Ms Gorman, 22, drew international acclaim for her inauguration recital of her original work The Hill We Climb, a poem inspired by the January 6 attack on the US Capitol.
She is the youngest poet to recite at a presidential inauguration, a role first given to Robert Frost by John F. Kennedy in 1961.
Ms Gorman also became the first poet to perform at the Super Bowl, America's most-watched TV broadcast of the year.
In another tweet on Friday, Ms Gorman wrote: "In a sense, he was right. I AM A THREAT: a threat to injustice, to inequality, to ignorance. Anyone who speaks the truth and walks with hope is an obvious and fatal danger to the powers that be."