By Veronika Bondarenko A famous face is promoting the chain’s new pollo asado entree. For a fast food chain, a celebrity endorsement has long been the way to get people to try a new or stalling item. Who can forget McDonald’s (MCD) – Get McDonald’s Corporation Report-Michael Jordan collaboration from the ’90s or the Shaq-A-Roni pizza at Papa John’s (PZZA) – Get Papa John’s International, Inc. Report? With over 28 million followers on his combined social media channels, 23-year-old YouTuber Karl Jacobs is the perfect famous face to promote a particular food item to a young audience — and that i…