I have 5 unique articles written for my keywords and I'm going to submit then to article directories. I noticed there are lists with 100's of these directories. Should I 'spin' the articles so that no two directories contain duplicated articles? So, for example, if I submit 1 article to 50 directories I should have 50 different versions of that same article created? A Also when I'm creating backlinks by submitting to web2.0 sites, is it worth submitting a link to the article directory link or should I only worry about linking directly to articles on my main site? or is it better to do both?