Saw this reported on one of the blogs.
This is a bad move and I really hope it's temporary. The folks on the @
Delta twitter were incredibly helpful and I consistently found Twitter to be the fastest, simplest way to make simple changes or request simple tasks (e.g., mileage upgrade availability on international flights, RUC availability on domestic flights, etc.). When you don't have time to call, Twitter was easy to just fire a quick DM and then have that task taken care of without waiting on hold or having to speak with someone.
Complex questions still best handled by calling DL (and during normal times not a big deal for a PM) .