To have the most liked post on social media is like having the high score on the Internet arcade game. And according to Instagram, countless venerable news sources, and the Guinness Book of World Records, that honor doesn't go to a sponsored Ariana Grande engagement pic or a group photo teasing a The Office reunion or even a stealth marketing campaign where Wendy's calls Jack in the Box a "cuck." The honor goes to a simple picture of an egg.