A nice example of how businesses and bloggers can help each other: a US blogger decided to review all 51 sandwiches offered by the Which Wich chain, and when the firm got wind of it they put his URL on their packaging.
As Marketing Monster says:
This is absolutely fantastic and gutsy. Why gutsy? Because Chris gives an honest critique and says that some of their sandwiches are just plain bad. Why fantastic? Because the sandwich chain increased its popularity by embracing Chris’s efforts.