I think that double posting the same content is disingenuous. Yes, you have higher visibility for a post. However, you can always try to link to your post in other ways and drive traffic to an article that way. Say for instance there is a similar post that someone else has put up and you have a tangibly related post already. Link to it in the comments! I find this to be much more reasonable than seeing duplicate content, or nearly duplicate content, in various sections.