Starbucks, thirsty for some social media magic, is releasing its latest sugary concoction: the fortune-telling Crystal Ball Frappucino. The candy-sparkles festooned drink will be available for five days in the U.S., Canada and Mexico. It follows similar limited-time drinks, such as the coffee chain’s color-changing Unicorn Frappuccino. Starbucks hopes the cream-based new drink, which is...