250 million videosand counting! YouTube is one of today's leading sources of entertainment, with people around the world buzzing about which clip is making them laugh or cry, leaving them shocked or amazed. It even has the power to create global celebrities, from Mao Mao the sneezing panda to Justin Bieber. Here is YouTube's very best, with QR codes for super-quick referencing. Featuring viral hits as well as highly creative unknown videos, this is the perfect gift for both YouTube fanatics and those new to the site.