It doesn't surprise me at all that this is going on. There are lots of social media fan pages that are run by real people who post real content 99% of the time but are willing to post promo material for a fee. Usually that fee is pretty high, easily $100-500 depending on the account's follower count, with different price points for how long it stays up (pay more for a permanent post, pay less and it gets deleted after X number of hours). It's really effective because those accounts already have a well-established presence and function as tastemakers.