The singer and actress has been on the receiving end of death threats since rumours emerged that she was dating Justin Bieber.
And the 18-year-old said that her song titled Who Says? deals with her experience.
She told Ryan Seacrest on his KIIS-FM radio show, 'When I heard it, I felt like my fans need this song right now, especially with Twitter and Facebook. I feel like it's really negative for me.
'Within that world, there's just such easy access to people's feelings. This song is such a great message to my fans, and it really touched me when I heard it.
'Basically, it's to the haters, it's to the people who try to bring you down.'