This week was another volatile one for investors. Among the 10 biggest losers were the country's largest digital video service provider, recent IPOs specializing in edgy headphones and online dating in China, and even a smartphone company with 70 million subscribers. Recognize any stocks you own in here -- or some you might like to buy?
Research in Motion needs a hit, badly. The once-formidable smartphone maker has been dominated by Apple and Google of late. Is its new social music service well-crafted enough to attract the young customers the company so obviously covets?