Sexting refers to sending sexually explicit or pornographic content by mobile phone. It began as sending sexual SMS messages but now includes sharing photos and videos. A 2008 survey found that 22% of girls and 11% of younger girls aged 13 to 16 reported sending nude or semi-nude photos of themselves electronically. Sharing sexual messages was more common than images, with 39% of boys having sent them and 50% having received them. Sexting has grown with advances in communication technology that facilitate new forms of social interaction, though sharing explicit content electronically poses risks if it is easily distributed without the sender's control.