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Surely Salon is aware that it is now more than ever possible on the internet to gain highly detailed information about private individuals.
(A satellite photo of my address, commonly available free-of-charge via a famous search engine, shows my home and the property around it in amazing detail.)
Surely Salon is aware that it is now more than ever risky to publicly voice opinions on a great many subjects: abortion, US foreign policy, gay marriage, Islam, etc.
While Salon's writers of course make themselves vulnerable by publicly expressing their thoughts and opinions, they are paid for doing so and also have the weight and authority of a well-known institution to stand behind them should some fruitcake decide to make them the target of his ill will.
I've very much enjoyed contributing letters to Salon, but I haven't enjoyed it so much that I'd be willing to compromise my privacy and personal safety in order to continue doing so.