The famous pastel-colored, sugar-filled Starbucks’ Unicorn Frappuccino has come and gone but not without leaving a major impression. Starbucks’ highly successful concoction caused a stir on social media and even ended with a lawsuit. The coffee chain debuted the colorful concoction on Instagram, which was met with an overwhelming amount of user-generated content soon after. Audiences shared over 150,000 posts of the drink – and that was just on Instagram. So what is it that…