A computer hacker known as the "Jester" who calls himself a "hacktivist for good" is taking credit for temporarily taking down the WikiLeak...

Twitter was down for many users even as the micro-blogging service was trying to fix the problem. Simple passwords: Big risk I Gmail, Yahoo...

Cyber attacks hammered Twitter, Facebook, and Google on Thursday, disrupting the hip micro-blogging service and causing stumbles at the hot...

The bad guys' main weapons in such an attack are "botnets," or networks of "zombie" personal computers they've infected with a virus.