Do I use same content in blogging and article marketing? If I use it is that any negative effect on my keyword ranking or not?
Just make sure that you publish it on your blog and let Google index it before you syndicate it elsewhere. Setup a Google + profile and use the rel=author attribute to your profile then link back to your author page on your blog. That way Google will know that your blog is the rightful author of the content when it gets indexed elsewhere.
Unique content is like gold... Keep it original, search engines love it, every place where you can submit articles love it. You don't want to risk getting sandboxed with duplicate content.
Google accept only fresh content. If you post same content on different different website then you will not get more benefit doing that.
Thanks All for nice reply.... Actually "Content is King" So Its very necessary thing to have fresh contain and the second thing is in article we can not pronoun our company name and don't use pronouns like "You" "I" "We" so we should try to write new and fresh contain for our article....
You should not use same content again and again. You're only wasting your time if you're doing that because one of them will be considered as duplicate content and no benefit will be given to your site from that piece of content. Always try to post fresh and quality content even if you are posting twice in a month.
Always keep in mind that google doesn't like the duplicate content so never think to use duplicate content.