Kellinger is correct
"If you had a good experience, please go write a review on Yelp" is not shilling. It's telling people that a popular review site exists so that they can go there and write a review. Jesus, don't you WANT people to know about Yelp?
If you don't know that Yelp exists, then why would you go there and write a review of ANY kind? Are people just supposed to magically learn that Yelp exists? How can the CEO of an ADVERTISING COMPANY be this stupid?
According to your attitude, you're only allowed to post a review on Yelp if you NEVER HEARD OF IT BEFORE. (Unless you're flaming the place, because negativity is always objective right?)
Oh, and I like the plan, here. It's all done verbally, so there's no evidence beyond he-said-she-said. "Will nobody rid me of this meddlesome priest?"