What is what does black profile picture mean?

A black profile picture is often used as a symbol of protest, grief, or solidarity. This trend started in 2020 after the murder of George Floyd and other incidents of police brutality and racism. Blackout Tuesday was a day of solidarity where individuals, organizations, and companies posted a black square on social media to show their support for the Black Lives Matter movement. Since then, some people have continued to use a black profile picture to signal support for various causes or to acknowledge personal struggles or loss.