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Post do not have to always be stories or submitted articles. Your comments also count as post and can make you money. I read this in the white paper. So good related comments count also, you see active users have thousands of post and maybe a few blog post.

That is true... but remember you can always just post about somthing random that happened to you during the day, or a random thought you had, or even a funny joke you heard. You can also post news stories that you found interesting..... as long as you cite them ;)