http://www.carrotmob.org/
From the liquor store example in the linked article, it was clear that there was an F2F element - doing something good together and having fun.
These kinds of 'positive' applications imo will be the pioneers. Being angry at a corporation is a 'negative' - it's no fun, and there is an element of revenge. These kind of applications will come, of course, but the carrotmobs et al will be proof-of-concept. You can't be me, I'm taken
