According to TVGuide.com (http://www.tvguide.com/tvshows/icarly/episodes-season-4/289614).
Episode Synopsis: Gibby wants to sabotage Sam and Freddie's romance, and Carly is torn about whether to help him. Original Air Date: Sep 17, 2011
Oh and for iDate Sam & Freddie it says:
Episode Synopsis: Carly settles a disagreement between Sam and Freddie, and soon they rely on her to play peacemaker. Original Air Date: Sep 10, 2011