How can technology keep track of you, your friends and everyone else?

Technology, such as computers, can help keep track of people by use of things like social networking sites. They allow people to talk to eachother and keep in touch even if they are on the other side of the world. There is many of them and some of them include Facebook and Myspace. Most social networking sites are not like any other. They serve the same purpose but work a little differently, so you can pick which one you like the most.