When I submitted my article on this site, It seemed that my article didn't need reviewing by the admin of this site and it was published immediately when I submitted it. So does Goarticles allow duplicate content articles? if so, links on this article site are really valuable?
Yes goarticles allows duplicate articles, I submitted couple of articles in goarticles that wasn't orginal and they get approved instantly.
they do get approved.. but i haven't seen even one ranking on 1st page on google for popular keywords.. dup content plays a part.. how, when, where.. no idea.. just stick to basics and avoid dup-con
This feature of Goarticles can be exploited. A smart person would just copy his competitor's 'newest article. and add it on Goarticles with his link on it. Considering Goarticles' reputation, it is more likely to get indexed there by Google.
if you will be use duplicate contents than Google can be banned to site so always use fresh article contents.
don't be posting dup content. Google will rank one in the SERPs but put the other one in the "supplemental index". So you would be wasting your time.