Myspace accounts have been getting hacked for ages now, it has nothing to do with PS3. All band pages got hacked recently, myspace blamed social engineering / weak passwords and cleaned the pages -> they got hacked again the very next day.
That site is not secure. I can't understand why people use it anyway, every time I've seen a page it's a horrid mess of music, animation, textures and some worthless junk information about some person and other nobodies commenting about that non-important persons non-important life.