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Have you read the new TOS (terms of service) for Facebook or Google? Since they have a wealth of users, they are leveraging those profiles for advertising purposes. You can allegedly opt out of Facebook, and Google has an opt-in step, but who knows who else is out there waiting to use your personal information to sell things. Randall Munroe at xkcd knows how to get around all that no matter what small print you neglected to read.