Motivational speaker and author Lizzie Velasquez has spoken out about online bullying after she was the subject of a cruel meme shared on Facebook.

Ms Velasquez, who suffers from a rare, inherited condition which means her body is unable to store fat, saw the picture, which featured a photograph of her smiling and the text: "Michael said he would meet me behind this tree for a bit of fun.

"He's running late, would someone please tag him and tell him I'm still waiting?"

The aim of these pictures is for people to tag their friends in the comments under the post, so they can laugh at the idea of their friend being romantically linked to someone unusual-looking.