"Think before you say something hurtful to someone else," Justin Tweeted. "It may look like they're okay, but they're not. Words are more powerful than you think." Justin went on to link to an anti-bullying video and Tweet the hashtag "#stopbullying."
Selena is reportedly "terrified" by threats from some Beliebers and hopes her new single "Who Says" will encourage haters to back off. Justin is currently on the European leg of his My World tour and spending the next few days in London before moving on to Manchester, England.
What do you think of Justin's anti-bullying Tweet? Should Selena be worried about the threats or ignore the haters?
Photo: Courtesy of CBS