So I saw a page called "The story of this wiki" and it's really silly. So I decided to make an actual timeline of the story of this wiki, so here it is!
Fredbear's Family Diner
Basically where every timeline starts off, Fredbear's is mostly the same as it is in the canon series. It's barely ever featured in backstories and to my knowledge is only featured in one game, which is still being made. So, it isn't really that important other than the fact that it is the sole one that exists in all timelines.
Freddy Fazbear's Pizza (Generation 1)
Now is where the timeline splits up. Some people don't think this pizzeria exists and jump right to the FNaF 2 pizzeria, while others think it excists but barely ever feature it in backstories. This is usually considered the least used pizzeria. But as I said, the timeline begins to split from here.