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2.
A method of banning users where their posts are visible only to them. Created to prevent spammers, trolls, and flamers from realizing they have been banned and creating new accounts.

Considered underhanded chicken-shit behavior by trolls who hate being trolled.
I’ve been posting right-wing crap all over the forum, but no one is biting. I think I’ve been shadowbanned.
by username951 May 25, 2011
 
1.
Banning a user from a web forum in such a way that the banned user is unaware of the ban. Usually takes the form of showing that user's posts/profile/etc. only to that user; other users never see them. Considered underhanded chicken-shit behavior.
Fark has turned into a bunch of shadowbanning pricks.
by Atario June 20, 2007
 
3.
A silent ban on an individual user for violating terms of use or etiquette on a news aggregate website. A banned user is dropped from the system without any warning or explanation. Also know as a zero point ban.
"I kept submitting content and got no responses, until I messaged the mods and found I was shadow banned from that forum."
by standtheretilsober September 12, 2013