I am not suggesting a democratic end-user process, I am suggesting making the investment of a fact-checking department that any credible news source would be delighted to fund and create. The end-user process is the sharing, the veracity metric must be up-stream, or something that is triggered once a threshold number of users start sharing/approving something. To know the veracity of something that "goes viral" would be valuable, and the veracity metric is not something that end-users would be able to edit directly.