The best anyone can do is learn from experience. The SEC explains how they operate on their website. They do not share information at the risk of compromising their investigations.
More often than not, when you see warnings from other investors, they are valid. Consider it a public service and investigate both sides before discounting anything. Always confirm DD, refuse to have it spoon fed to you, iboxes are useless and contrived.
Finally, take note of the loudest promoters who always blame mythical forces like naked shorts or air shares. They always seem to be around for the runs and quietly vanish unscathed when everything falls apart. I think you understand.
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