[GHFigs]

Big Corporation pay celebrities money to give favourable reviews and endorsments all the time .

The difference is that there is no pretense of it being an unbiased opinion. The kinds of review sites that offer paid placement generally rely on deceiving the reader into thinking the review is honest.

By the way, could you tell me the name of your product or service? I'd like to know so that I can be sure never to trust any reviews of it.