Post History

Actually, in [the page](https://meta.codidact.com/ca) random isn't what we think. If we check [random in Q&A of Codidact meta](https://meta.codidact.com/categories/3?sort=lottery) than we will see that post are showing randomly. Post lists are changing every time (when we reload the page). But, in ad random means it will change in few hours. It may be 1 or 2 hours (I think 2 hours but, I am not sure cause, first time it changed in 1 hours for me). When I asked the question [Community-promoted network posts have arrived](https://meta.codidact.com/posts/279984) was showing for me. When I checked again (1 hours later) [When clicking "mark read" it shows a 0 when it should actually dissapear.](https://meta.codidact.com/posts/280367) was showing then. When I checked again ([10 minutes ago](https://meta.codidact.com/posts/281997#comment-10591)) [Ability pages 404 when logged out unless they're for a specific user ("?for=" in the URL)](https://meta.codidact.com/posts/281910) was showing. When I checked again now `Community-promoted network posts have arrived` is showing again. 

From the above text, I understood that when I checked first time `Community-promoted network posts have arrived` wasn't showing 1 hours ago of that time. When I checked 1 hours later (2 hours later of `Community-promoted network ...` post shown) I seen [the post](https://meta.codidact.com/posts/280367)'s ad. When I checked again 2 hours later [this post](https://meta.codidact.com/posts/281910) had shown. 

So, posts are changing in every 2 hours.