You can't plagiarize ideas. Multiple people can have the same ideas, as long as they express them in different words it is not plagiarism. There could be a lot of reasons why you'd not get upvotes and @voltarius did. It's the way the system is.
Course, throwing out your comments and then a link to your article is rather spammy.
Thanks for the input! I agree with you completely. Writing about the same subject doesn't make it plagiarism. :)