Whether you want to target politicians, your employers, or companies that have done you wrong, there are a variety of sites across the Web that will help you voice your complaints. But beware that not all of them will actually solve those problems.
Anonymous Employee Those having trouble at the office should try out Anonymous Employee. The service allows you to create a user name and password without requiring an e-mail address. After that, you can input the name of your employer, the person you want to contact, and the issue you want to make them aware of. Anonymous Employee automatically sends the message to the recipient without identifying you.
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Source: CNET