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Remember: Only flag things that are truly inappropriate or offensive.
When you flag a message, you draw the attention of every mod and 10 k user currently on the chat network. This means you should only be flagging things that they’re going to see as offensive as well, which includes:
Personal attacks (characterized by you, e.g., “You’re a moron.”)
Anything that shocks the conscience (yes, this is subjective — let your conscience be your guide.)