The 14-year-old girl from New Jersey was arrested after uploading 30 explicit images to the social network, according to US media reports.
She posted her photos "because she wanted her boyfriend to see them", a police spokesman said.
Authorities arrested her after receiving an online tip-off about the images, which could have been viewed by anyone who "friended" her on MySpace.
MySpace has not commented on the incident, but has a team which reviews content uploaded to the social network.
The New Jersey case is the latest in a series of legal wrangles surrounding teenagers’ use of mobiles and the internet.
http://www.news.com.au/heraldsun/story/0,21985,25250127-661,00.html