I have a question for reddit users. Why don't my submissions show up on the New page? Is there some sort of filter or time frame when posts are shown?
They do have a spam filter designed to detect spam posts. However, legit posts can also be caught by the filter. If minutes go by and your post isn't showing up, it has probably been caught by the filter. This is most likely to occur if you post to a subreddit that you have not participated in before.