There's a new version of Facebook available on the Market, but because the Desire comes with the official Facebook app already installed it doesn't prompt you to update it. When you click to install the version on the Market, the phone is clever enough detect the preinstalled one and applies it as an update, so you don't end up with two Facebook apps in the phone menu or Manage Apps menu. After installing it the Manage Apps option changes from 'Clear data' to 'Uninstall updates' and the version has gone from 114 to 121. You'll also notice that the 'Take photo' tile has now been replaced with 'Inbox'. There's still no option to tag people in images.