Shadow banning (also called stealth banning, ghost banning or comment ghosting) is the act of blocking a user or their content from an online community such that the user does not realize that they have been banned.
By making a user's contributions invisible or less prominent to other members of the service, the hope is that in the absence of reactions to their comments, the problematic user will become bored or frustrated and leave the site.
Michael Pryor of Fog Creek Software described stealth banning for online forums in 2006, saying how such a system was in place in the project management system FogBugz, "to solve the problem of how do you get the person to go away and leave you alone". As well as preventing problem users from engaging in flame wars, the system also discouraged spammers, who if they returned to the site would be under the false impression that their spam was still in place. The Verge describes it as "one of the oldest moderation tricks in the book", noting that early versions of vBulletin had a global ignore list known as "Tachy goes to Coventry", as in the British expression "to send someone to Coventry", meaning to ignore them and pretend they don't exist.
Craigslist has also been known to "ghost" a user's individual ads; and reportedly entire accounts. Reportedly, an ad is placed and confirmation is sent that it has been posted; the ad may be viewed in the user's account, but, if ghosted, will fail to show up in the live listings.
Early on, Reddit implemented a similar feature, initially designed to address spam accounts, though it is also used for general users. In 2015, Reddit added an account suspension feature, though still makes extensive use of shadow banning.
In a study that looked at tweets from 2014 to early 2015, over a quarter million tweets were found during the one year period in Turkey to have been censored via shadow banning. Twitter was also found, in 2015, to shadowban tweets containing leaked documents in the US. In January 2018, a Twitter spokesperson told Fox News, "Twitter does not shadowban accounts." There is some controversy as to whether or not that statement by a Twitter's spokesperson is technically correct.
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So one of the things we did in FogBugz to solve the problem of how do you get the person to go away and leave you alone is, well, you take their post and make it invisible to everyone else, but they still see it. They won’t know they’ve been deleted. There’s no one fanning their flame. You can’t get into a flame war if no one responds to your criticism. So they get silenced and eventually just go away. We have several ways of telling if they come back, and it’s been proven to be extremely, extremely effective. Say a spammer posts to your board and then they come back to check if it’s still there, and they see it—to them it’s still there—but no one else sees it, so they’re not bothered by it.
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