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It's useful advice if you discuss any topic or are a part of any community on the internet. There are a lot of people on the internet who are not capable of interacting in "proper" society,. Sometimes this provides a useful outlet to allow socialization, sometimes providing the opportunity to hurt others in ways that they might not do in person. These people are rare, but with enough of an audience, common. I helped run a fairly large (~200k member) private community forum and encountered these persons regularly, friends who did the same and had their personal information online for their freelance careers were not so lucky, threats were made, etc.

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