Published Thursday, 02 February 2012
Knight will miss two games for Glentoran. (© UTV)
It is the first time an Irish League player has been suspended in connection with a social networking site.
Knight is believed to have made the comments while he was a Coleraine player, but he will now miss two games for the Glens.
In a statement the IFA Disciplinary Committee said Knight's ban will run from 6 February.
It said: "The IFA Disciplinary Committee, having considered the written and verbal evidence provided, decided that Leon Knight be issued with a suspension from Monday 6 February 2012 until Coleraine FC has completed three matches in domestic competitive competition."
Knight completed his move to the Oval on Monday for an undisclosed fee.