If you're bothered, matey, read this: 'Facebook users unwittingly reveal details' and this: 'Mobiles could spell the end of privacy': basically, Google et al. are tempting you to run location-sensitive applications - so that they (and whoever is tapping in to your account) and all the world's advertisers, know where you are for the rest of your life.
On the other hand, if you think technology can be fun, you'd be right. You can now use free Guardian APIs to do odd stuff, and one fan has tracked the history and characteristics of swearing in the Guardian. According to the graph, 'wank' is much underused. To the comment boards!