Originally Posted by JDR13
Ok, so it's possible to switch from online to offline at will without affecting your current playthough? I wasn't sure if the saves were compatible.

Spoiler

I heard there are several points in the game where you can still be invaded by AI controlled NPCs.

On the PS3, you can switch without problems; on the PC version things are not so simple, because of the reasons explained above (GFWL uses different saving slots).
To answer your question,