Used to be a great demo put on by the SCSR lot at Mountbatten (so pre-internet days) on how much information they gleaned about one of their 'customers' from his engagement announcement in the Daily Telegraph. All from using phone books, RAF lists, electoral registers etc. If I remember correctly they had IP to Tgt maps drawn up for his house, the best mans house, and both sets of parents. May of course all have been scaremongering - they must have a field day in this day and age.
On a separate issue this thread seems to have taken a bit of 'Pruning' - guess at least one person has been sent to the naughty step!!