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I did,.
I want to remind you not to be easy to flag, you will get danger with it.

I'm aware of "revenge flags", but I want to keep observed tags clean. If tag is mess then why even use proper tags?

We are notified by friends to use that tag. We do not know what it is.

Then your friends should use other tags because here polish community use polish tag to post informations in polish language and everything related to polish. If you don't want to be flagged by others then it's better to not using polish without proper reason.