Twitter too in some ways. Publicly say something negative about the company and if they have a reasonable support team you'll be helped instantly. Tmobile is really good about this, as is Delta and Chase. Also surprisingly enough got some good support from California DMV over twitter. Who would have guessed!
In a recent hellointernet episode, they talked about how companies have essentially trained them to do just that. If you have enough public clout it seems to be the easiest way to get a response.
