From another industry: https://www.reddit.com/r/AMA/comments/1p7kmbn/i_was_paid_to_...

I don't have much proof, but given the incentives and the possibility of doing it I'd be surprised if it wasn't happening everywhere. How much would be enough to pay the top 50 influencers in a market to push something? To hire 100 people to be active full time on all social media sites? To a company with billions they wouldn't even notice the expense

Default to skepticism and double down on your critical thinking skills. More important than ever today