I see so many duplicate articles in the article submission sites, still google showing them on first page for their title. I have learned that google always look for unique content in websites. This seems to be false. Why it is not followed for article submission sites? Does really google look for unique content or since it is article submission site, google is allowing them to have duplicate articles?
there are thousands of article directories and its extremely difficult for google to index every single article and then find the similarity with other articles submitted on other sites, then removing the duplicate ones from indexing. some of the duplicate articles may eventually get deindexed but if you submit the same article to 100 or 200 articles sites, you will end up having lots of indexed pages at the end. dont worry too much about duplicate content penalty on article sites as yo cannot get penalized for having duplicate content on 3rd party sites. you can only get benefited form backlinks and traffic.
suppose if we use those duplicate articles in our blog or website, will google penalize our blog or website? how this will affect our page rank and getting indexed in google search result?
Actually. not so like this. Google doesn't consider any duplicate, even that site where we post neglects it to accepts any one duplicate. You can try yourself....
Its also not clear to me. If I have my own site with full of content, and if sometime I use few part of my content as article and posted it to different article site say top 10 article site. Is is right or wrong from google point of view...
if the home page is unique and the inner pages have duplicate content..will our whole site be blocked or only inner pages? what is the difference? will our homepage be indexed on google?