They give with one hand, then take away with the other. At least, that's what the new Android 2.3.3 update for the Google Nexus One and Nexus S seems to do.Let's look at the positives first, the leading one being the arrival of Gingerbread for the Nexus One. Suddenly, that phone is looking like a very shrewd purchase last year. As we have mentioned before, this should mean more speed, longer battery life, NFC connectivity, an enhanced keyboard with multi-touch support, WebM video playback, a new Downloads application and enhanced copy and paste to name just some features of the update. All for free of course.However, this isn't Android 2.3, it is Android 2.3.3, which applies to both the Google Nexus One and Nexus S. To be honest, this is mainly big fixes and minor enhancements, including an end to random reboots for the Nexus S, a redesigned keyboard for easier touchscreen typing, an improved app management system, enhanced NFC communication and contactless payments over Bluetooth plus enhanced image viewing/decoding.All good. But not so good with Facebook. According to Engadget, the update also disables contact syncing in Facebook on the Nexus S. So as soon as you get the update all that contact information will disappear from your contacts app on your phone. Why? Well apparently, it was against the official rules of Android apps, with apps ordinarily having to use Android's contacts API rather than being in 'the cloud'. Facebook originally had an 'opt out' to keep its contacts elsewhere, but this has now been rescinded. It is probably part of a wider privacy/data issue, so may or may not be permanent. But if you are grabbing the update, it's worth thinking about, especially if you rely on those contacts.