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It's hardly the first time this point has been made and, as the author points out, it is as true of Google as it is of Facebook. The key, I believe, is to carefully consider, in light of this reality, what information you wish to share and whether you are getting something worthwhile out of this transaction.
It's an old adage that if something is free then it must be you that is the thing being sold. This has certainly been true of parts of the media in the past and is even more so now. Someone, anyone, o...
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