The reason for asking this question is facebook support that I want to provide.
Since there are crucial differences between iOS 6 and 5, I am confused.
1 – If I support only 5, I am losing serious user base, right? Does anyone has any country-wise analytics as to how many use which OS?
2 – If I support only 6, what all testing would I require? Do I need iOS 6 device or simulator is fine as far as facebook is concerned?
I don’t know any page that publish country-wise stats, but for example here you can find stats from one developer and they are similar to stats I have access to (sorry, but I cannot publish it) – anyway you’ll loose around 20%-25% of audience when you’ll support only iOS6.
You should always test on device before releasing – mostly app is behaving same on simulator, but not always. IMO one should even test on more devices (like iPhone3GS, iPhone4, iPhone5 etc.), but of course it is not always possible.