Board Thread:Questions and Answers/@comment-17701320-20130904204409/@comment-1038387-20130905125618

Wonder Woman and Alan Scott too.

We don't really know why they did 52 titles. 52 is a number that has been used before, for the previous multiverse (which existed of 52 worlds) and the series that kickstarted it, 52. That was a weekly series that covered the "missing year".