Lets say I allready made an articles my self, which adverts my products and my portal also. And for example i will post this article to twitter and any over networks, blogs... And my article will be like a copy, same like in over portals, identical like evrywhere. Is that not important and I can do it or must I write new article in every different portal or network ?
Posting an article to Twitter probably wouldn't be such a good thing. Posting it to blogs is smart though. Just make sure you're getting a dofollow link! Posting a copy of an article to 100's of article directories and blogs is not a good thing. Google loves unique content, not duplicate content! You'll advance much further in your link building with unique articles, believe me.
Well it would be counted as Duplicate content and the other pages apart from the original will not rank well.
I think duplicate content myth is overhyped, you can promote the same article on blogs, article directories etc. but sure some of them will get 'filtered' and won't add value to your site.
Write good content, and if you copy it from google, tweak it properly so that it don't appears to be duplicate. Provide a catchy headline. Na d submit it to high pr, do follow article directories.
Here's how I approach dupe content: Always use original content for your own site. It's not that hard to crank out 300 - 500 words of original content, or to hire someone to do it for you. When it comes to building back links from web 2.0 properties or artciel directories, I don't worry about dupe content. I write an original articel (one that's NOT on my site) and I mass post it to 20 - 30 article difrectories. Maybe it gets picked up by some bloggers who use aartciles for content, or maybe not, but all I' m worried about is getting back links from different IPs....