One thing that I have noticed on other forums, people taking pictures with their phones and posting them to the forum. I have been able to get the GPS location on a large number of the pictures. A lot of the pictures are taken in their driveway or around the house, this would make it very easy for someone to know where to find the tractor in the picture. I have written to the operators of the forum that I have been able to get the most data from and asked them to strip out that EXIF data from the JPG images to protect the posters of the forum, but I haven't heard anything from them.
Just something to think about when you post pictures of your tractors or anything else you are post a picture of.
My background is in computer security in case you are wonder why I would be checking images for GPS data.