Sony has announced that Gran Turismo 5’s online features will conclude as of May 20, 2014. Additionally, the online features for the entire Resistance franchise on PlayStation 3 will conclude on March 28th, 2014.
Finally, as of January 28th, 2014, online support for MAG, SOCOM: Special Forces, and, SOCOM: Confrontation will no longer be available.
You will still be able to play all of these games offline, if you choose to do so.