The PlayBook isn't even two months old yet and it's already scored a second update to its QNX-based OS. First up from BlackBerry Tablet OS v1.0.5 is an upgraded Facebook app, which is now a preloaded part of the system software and can do some really neat things like delete unwanted messages. Devs will be happy to hear that they can include in-app payments, while our European friends should be excited about the expanded language support. There are a few other welcome changes, including some enterprise-friendly twe
