Get a 360. Not only can you play with me then, but PS is getting hacked again once they get everything restored again. The guys that did it the first time are hell bent on putting Sony out of business.
Also, slight background:
Zombies everywhere in US, soldiers from other countries also in US killing zombies and probably occasionally survivors. Majority of soldiers are Russian, as US was at war with Russia before the outbreak. US is no longer US and is no-mans land that belongs to anyone still living in it.