"Amazon's data-tracking software watched what else these people purchased..." We know this is a common procedure at online stores and social network services.

"Amazon's data-tracking software watched what else these people purchased..." We know this is a common procedure at online stores and social network services. Still I was shock from watching myself using facebook and experience the way it works. I am using facebook to keep in touch with my customers. And very often names do appear multiple times. So who is the right person? Very easy... facebook in combination with a human sense of your customers habits it is a very strong tool to keep in touch with somebody you know. I was amazed by myself how easy it is to get the right person out of 10 just having a shot look at their timeline.