Pablo Reyes isn't famous; he's just a guy who can predict the future. Reyes posted a Facebook status predicting the death of Harambe (the silverback gorilla who was killed by zoo staff when a little boy fell into his enclosure in May) and the subsequent public outrage, as well as the death of Muhammad Ali, and even the Orlando nightclub shooting. Sure, all that stuff has already (sadly) happened, but his post is dated December 26, 2015. The prescient status has been shared almost 190,000 times, because predicting the future is a really impressive feat!
The comments on his post showed just how impressed/freaked out people were with his clairvoyance.
Except—Reyes didn't predict the future. Come on now, people. All Reyes did was write a post and then change the date on it, using the little clock icon. Once the status is ready to be published, Facebook will even ask you if you want to notify people about it. And of course you do, because you've just predicted the future. In the immortal word of Keanu Reeves, "Whoa."