Wow - Check out this article, "Mobile Social Networking Revenues Could Reach Us$52 Billion by 2012", from Cellular News.
"Mobile Social Networking is already an established service in some regions, but in 2008 and beyond new features are attracting larger numbers of users and permitting new business opportunities. Mobile Social Networking is now a global phenomenon with expansion in all directions.
Over the next 24 months communities which foster friendships will continue strong growth in users and revenues. Entertainment community segment revenues will overtake in some regions in 2010. Other community segments focusing on productivity, fame and social shopping are beginning to emerge on mobile platforms, diversifying the offers and attracting people of different socioeconomic and demographic profiles to Mobile Social Networking services."