I believe it is good to have a database of spiritual and supernatural claims. Whenever we find a self-proclaimed prophet, medium, etc make any spiritual or supernatural claim we should document it and test whether it has been fulfilled.
For example there is a dude called Efrain Rodriguez ( http://www.express.co.uk/news/science/608979/Reverand-whose-imminent-asteroid-never-came-says-huge-space-rock-will-STILL-hit-Earth ) who claimed that an asteroid would hit Puerto Rico by the end of 2014 and a large part of Eastern US would be under water due to divine anger. Now it is 2017 and Puerto Rico is still fine. Hence the prophecy was incorrect.
As long as we don’t violate copyright laws we should just document whatever these claims are complete with links (i.e. The world will end by 2011! Damascus will no longer be inhabited by 2015!) and test them against reality if possible. Charlatans, false mediums etc can easily be revealed through this method. We will also tell these mediums, prophets etc that if they are real this will also be revealed in our database.