Muslims: Who or what is your 'imam' (guide) today?

Quran, 17:71-72: “One day We shall call together all human beings with their respective record book (imam): those who are given their record in their right hand will read it (with pleasure), and they will not be dealt with unjustly in the least. But those who were blind in this world, will be blind in the hereafter, and most stray from the Path