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Post your blog article and make sure Google crawls it first...then post 8 hours or a day later to the social news site and see if that fixes the problem.
As well, it may not be all bad to have some of the social news sites links on the 1st SERP. In some cases, this looks like the genuine 3rd party endorsement many sites need. However, if of course you intend to have the same content on your site - bhartzers suggestion makes great sense.