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In the US, one can fill out a police report, but that doesn't mean that the police will opt to press charges. If one contacts the police to report a crime, they still need probable cause to press charges.

As for witch hunts, folks do get burned in the digital age, whether as result of posts on a public twitter feed, or worse yet in some cases, privately via other social media channels or other (digital) communication mechanisms. Publicly outing someone or a group is perhaps a last resort, but necessary in some cases.