Ignorance rules, allowing misinformation to be a scourge on our society. Sometimes it comes by way of special interests. Many times misinformation is spread by people speaking about things as if they now what they are talking about, but they don’t. This only leads to disagreements in the future because no one can agree on a truth.
You can help this happen less. The first way is by letting people know when you are speaking about something you believe as opposed to something you know. The second is by questioning people about what they are telling you to determine whether they are speaking about something know or something they believe. You can do this in a respectful manner. It is similar to checking the facts.
I recently listened to a podcast of an interview with the guy who came up with Wikipedia. He explained why, at one point in time early on, they decided people needed to start including footnotes to sources when they were posting or editing entries.
It seems obvious why that is a good idea, and it’s no different than fact-checking during a conversation. If you do this, it hopefully will help stop the spread of misinformation, which is important because the facts matter.