Frustrating thing about tumblr is its not mandatory to see timestamps on posts. If you arent using them in this day and age, youre at risk of not understanding the context of a post or that the information on it may be out of date. I dont think this will reach a wide audience but if you dont have timestamps enabled go to your general settings->dashboard settings and turn timestamps on so you can see when a post written like it’s breaking news is actually from 2017.