Yesterday, the United Kingdom held a nationwide referendum on whether to remain in the European Union or leave in a so-called "Brexit." This morning, the results were announced: 52% voted to leave. The news put the future of the European Union into question, prompted British Prime Minister David Cameron to resign, and is wreaking havoc in the financial industry. From confused Americans and freaked-out Brits, these are the 23 best reactions on social media to #Brexit: