[SOLVED]What the difference between "green one" and "blue one" on forum

[PeterPalov]

Hi, so I don’t know what the difference between “green one” and “blue one” on forum. You know, it’s here:

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Please help me.

[Deadpool198]

The green one is for messages, the blue is for replies @s and (if you have them turned on) likes.
Danny

[PeterPalov]

Thanks! (20 characters)