As a primer to the study of prophecy in modern times, let me direct you to Skeptoid:
His analysis of Nostradamus is very revealing, showing how people use ancient texts to create fiction and sell books, newsletters, and other consumables based on prophecy. Today, there has been no medium, seer, or prophet with any sort of successful track record. Humans simply have no ability to see the future, and those who claim they do are either wilfully lying or delusional.
On the other hand, many people believe in some form of prophecy, even in small amounts, like Horoscopes. There is something to be said for giving people confidence and courage through the written word.