https://www.cnet.com/news/facebook-employees-appear-to-have-left-5-star-amazon-reviews-for-portal/

"Reviewing your employer's products is definitely against Amazon's rules. It's also not exactly an indicator of confidence in how well they're selling organically!" Roose added in a follow-up tweet. 

Andrew Bosworth, vice president of AR/VR at Facebook, responded to the tweet, saying the company didn't ask employees to leave the reviews.