Facebook has denied reports that users' private messages from several years ago have been appearing on their public timeline.
The FBI has denied claims by hacking group AntiSec that it snaffled millions of device IDs from an agent's laptop.
Samsung says an investigation of conditions at one of its supplier's Chinese factories has revealed problems with working conditions, but no child labor.
After four days of outage, PlayStation has said that external hackers are responsible - but the prime suspect, Anonymous, has denied all knowledge and says Sony itself is probably to blame.
Samsung has denied reports that it's been shipping PCs with key-logging software preinstalled.
Facebook is denying rumors that it is planning to build its own phone - but nobody much believes it.
Fermilab is denying reports that its Tevatron particle accelerator has detected a Higgs boson - the so-called God Particle.