I received some pretty convincing information that at least one big camera manufacturer is using Internet trolls to promote their own products online on several Chinese photography forums and websites (unfortunately I cannot publish the entire email in order to protect my source):
There is currently a major campaign from *** going on in a public Chinese forums. It’s done by a *** PR company using Internet trolls to post messages to promote *** products. The PR company has been known to use trolls for its clients for some time.