In the long run, we're all dead, said John Maynard Keynes once.
Tom Clayton of Bubble Motion writes on Techcrunch how Facebook specifically and more generally, other apps/companies that want to make it in mobile, can avoid death and instead position themselves for sustained growth.
The short answer? Cater to the feature phone users who still form the majority of mobile phone users in the world today by working with telecom operators.
Note that his advice is meant for those who have BIG ambitions and are ready to play the long game. If you want to be the fastest growing coupon company focused on iPhone users in Singapore who like croquet... (keep adding your own sub-classifications) you don't need to follow his advice.