Step 1: In-game web browser (probably Firefox-based), even if it would officially be limited to accessing The Lodestone (without formatting/etc errors).
Step 2: Make a version of The Lodestone that's compatible with PS3 specifications/controls.
Step 3: Square-Enix hosted voice client which is accessible through The Lodestone's linkshell features.
Step 4: ???
Step 5: Profit.