The NPD market research agency, responsible for the publication of monthly sales figures on the U.S. market, has just published a new study on this time to the platforms used in online gaming. According to this study, the Xbox 360 to win than the other consoles and even behind even the PC, with an average of 7.3 hours per week spent by users who play on Xbox Live. Following is a PC with 6.6 hours per week and PS3 5.8 hours. This is not surprising given the great quality of the online service of Microsoft and its games.