A false claim that a security threat against Liberal Leader Justin Trudeau was made up by his political staff has been circulating widely online.

In the past 24 hours alone, the claim has been shared thousands of times.

Even though there is no truth to it and it comes from a website that masquerades as a news source, Facebook says it will not take it down.

CTV's Richard Madan takes a closer look why claims like this spread and why Facebook isn't taking any action.

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