Computer programs printing out "Hello world" is most common first example student programmers are directed to try. But most people don't actually want to say to Hello to the whole world, yet most people connected to INTERNET allow public profile like facebook, myspace, linkedin, your company, your university and Google+ of yourself give much information.
Most Google user, just have a Google advertising profile, built from the cookies Google uses to track my and your web searches, page-views and ad-clicks. So you can what age and gender, Google thinks are based on your Internet habits at https://www.google.com/settings/ads/onweb/
Most companies don't share the information they are gathering about you with you. So, be very careful with your privacy settings. Yes, I find it ironic I am using a public blog to warn about privacy.
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