There is no simple technology solution to protect children from bullying, pornography, sexual predation and other online threats, a new study says.

The highly anticipated report -- results of a year-long study ordered by 49 state attorneys general -- found that "a combination of technologies, in concert with parental oversight, education, social services, law enforcement, and sound policies by social-network sites and service providers, may assist in addressing specific problems that minors face online," according to a draft...