Here's a great infographic from Mashable that was sponsored by Ben & Jerry's (which seems kind of strange).
A couple of statistics that are not in this graphic are:
1) Mobile users are twice as active on Facebook as non-mobile users.
2) 18 to 34 year olds account for 50% of mobile social networking usage.
3) Female usage of mobile social networking is higher than male.
I haven't drawn any major conclusions from this info except that it confirms that the phone is for more and more day to day business and pleasure, and it sure looks like that trend will continue.
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