Your questioning of the source is correct, but the method is rude. Monitors are NOT allowed to be rude to members. Pl. consider this a warning.
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Instead of "who are u to explain?", consider this:
"Pl. let the original blogger provide the source".
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Direct questions like "who are you?" by Monitors demotivates and discourages RailFans, and give the perception that Monitors are ARROGANT and ABUSE their power. This reflects badly on ALL Monitors. Pl. take this admonishment seriously.
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Thanks.