I love to tell you something about article posting. Here so many seo expert try to build number of links from a single article. Means a single article has posted on number of sites. Now according to the Google recent updates in algorithm this is cause of penalty on particular keyword **means who will loss your ranking for time period and this time of penalty is totaly depends on your bulk of link building on your keyword.
If any knows more about this please make it share with us. Or any one **disagree with me make let me know.