Social networking apps have climbed nine places year-on-year in the App Annie rankings of monthly revenues (via The Next Web), moving from 12th place last January to third place in January 2013.As of January 2013, the Social Networking category ranked third in monthly revenues, behind only Games and Productivity in the iOS App Store. And that’s up 87% compared to January 2012 monthly revenues, representing 3% of total iOS App Store revenue. Its growth is impressive and nowhere near its ceiling.The study data shows that the messaging and dating apps are registering as the most significant revenue generators among social networking apps, with LINE,