"Releasing the names of registered sex offenders is only a first step for MySpace in ensuring the safety of children on their site," said best-selling author R. Stephanie Good, who is working with the FBI to tackle child abuse on the internet.
"As someone who spends a lot of time communicating with sexual predators on the internet for the FBI, I have to stress that so much more needs to be done to adequately protect children on sites such as these.
"Without more safeguards, children will remain extremely vulnerable, especially to those predators who have yet to be caught.
"As for those registered sex offenders who have been identified on MySpace, I encourage attorneys general to actively pursue criminal charges."
Good began a collaboration in 2003 with FBI special agents from Squad C-20, which handles crimes against children, to track down sexual predators on the internet.
New light-guiding nanoscale device can control and monitor a nanoparticle trapped in a laser beam with high sensitivity
Optical traps are scientific instruments in which a focused laser beam is used to exert an attractive or repulsive force on a microscopic object to hold it in place
Scientists estimate that the exoplanet has already lost up to 35 per cent of its mass over its lifetime
The observations were made using the Atacama Array in the Chilean desert
J1043+2408 was observed for more than 10 years, and its radio light curve exhibited a periodic signal repeating in about 563 days