Let's say the news is about a plane crash. At first it is reported that there are 10 deaths, but a few hours later it's reported that there are 100 deaths, and then 99 deaths. So imagine we are writing an article for a newspaper, or even a Wikipedia article. The reporter or contributors are trying to find out the truth, because their objective is to create "the perfect article". So when the later death toll comes in they will often rewrite the original article to make it correct, but in doing so they hide the original reporting. The reader will see an article that says: Plane crash: 99 dead.

Newspapers don't print feeds, there's no room. But if you have the archive to hand, as a database, then you don't need to make a perfect article. You just need to add updates as they happen.

Event 1: Plane crashes 10 dead Event 2: 100 dead confirmed Event 3: Actually 99 dead

This leaves the original events as a record of what was reported at the time, but the reader can also see the update. This is important to readers because while information can be added to articles, it can also be taken out, to try to conform to a narrative. Wikipedia is particularly prone to this kind of selection bias dressed up as fact-checking.

Confused: correcting mistakes is 'selection bias'? How is incorrect early reporting, news at all? The act of reporting isn't the news; its the thing that actually happened.

Often we don't know the facts until much later. Even then the facts may be a matter of opinion, or may have conflicting sources. The gun control debate is a good example where facts on both sides are used to support each side's biases. On Wikipedia we see one side using a particular set of facts and then deleting the other side's facts. The same is true in newspaper articles where certain awkward facts are conveniently left out of reporting and analysis. But what if both sides are correct? We'll never know what is the truth because there are always different ways of looking at something.

In many case, fact checking is often a way to hide bias under a veneer of authority, by proclaiming a selected set of selection bias facts as "the fact-checked truth". You only need to follow the major fact checking sites for a short time to see this in action.

The question is how can you effectively present conflicting information. I believe the article format is biased from the outset, whereas a more data-driven approach leads to less bias.