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@zverik @harry_wood @simon for what it's worth I once commented on Facebook post by an account actually named <website name>.com mentioning said website.

It got removed as spam ... for mentioning the name of the Facebook page I was commenting on.

And in my experience basically any mention of a URL in a YouTube Comment will cause it to be removed. So I tend to assume they're all basically using a big allowlist these days and blocking the rest.

Simon Poole

@InsertUser @zverik @harry_wood at the time I didn't add an url, it was literally just "OpenStreetMap".