Twitter API Policy team requires iOS app developer to apply for permission to use xAuth. They suggest me to use oAuth first, but as I'm using MGTwitterEngine, I am unable to use oAuth as communication, except when I use my consumer key & consumer secret .
But using the consumer key & consumer secret , I can only post to my Twitter, instead of allowing users to login with their account.
What have I missed in xAuth application process?
Seems iOS 5 has native Twitter support, therefore problem is then solved ( only in iOS 5 ). Still waiting for answers for iOS 4.