fbGetLongTimeToken: Get API facebook long time token.
Description
Change your short time token to long time token.
Usage
fbGetLongTimeToken(client_id= NULL,client_secret = NULL,fb_exchange_token = NULL)
Arguments
  
- client_id
- Your App ID. 
  
- client_secret
- Your App secret. 
  
- fb_exchange_token
- Your short time API token.