I find so many people on the internet who are quick to share articles as proof or quick to believe something on the internet is fact without doing research beyond said article/picture. They won't even look up the website to find if it is reputable or not. Basically they believe something is fact based solely on their desire to want it to be fact. Is there a word that describes this?
credulous -- "Having or showing too great a readiness to believe things." oxforddictionaries.com
This is not quite the same as confirmation bias (which might be closer to the sense you want) -- "The tendency to interpret new evidence as confirmation of one's existing beliefs or theories." (Definition from the same source.)