"Giving some celebrities Twitter is like giving a kid a loaded gun," said Allan Mayer, head of the strategic communications division at the publicity firm 42West. "Twitter can be enormously valuable as a branding tool. But like everything else, it's a double-edged sword, and if you have impulse control problems — which strangely a lot of celebrities seem to have — it can be very dangerous."

"Adobe Systems on Friday introduced a new Photoshop app for iPhone users that lets them edit photos from both their phone and their online library on Photoshop.com."

The app is free of charge and offers tools such as cropping, image rotation, color controls, and simple one-touch filter effects that can change the look and feel of shots all at once. It also features undo and redo controls so that if users make a mistake, or want to revert back to the original, it takes just a few taps.