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

There are many ways that technology can keep track of you. for example your cell phone has a location device on it, that way if you get kidnapped or lost the police can track your phone through the E911 location on your phone. It can keep track of your friends by saving their phone number, having a page on facebook or myspsace, email addresses and many other ways. If one of your friends move or change their phone number you can usually still find them online. As for everyone else they have information of all sorts out there like blogging sites, chat lines, dating networks, e-mail accounts, webcams, pictures online, phone numbers, you can call 411 to ask for phone numbers to people or businesses. technology is an amazing thing.