also beware of this type of spam that can be found here:
https://www.newgrounds.com/bbs/topic/1467591
It claims to giveaway "New Smartphone or one of several other prizes" and gives gives a fake Newgrounds link. Report the message if you receive it and tell your friends that they shouldn't click the link.
Pingu
Just hit the flag report button on the PM and it will log with all the other reports. Staff has been made aware
Neentandoo
I did that before with the 1st user and block them, and I guess they got banned. But I deleted the 2nd message but still blocked them.