Try to have some unique content so that it will be more worth

You should only submit an article to one website whatever the site is. Your site's reputation will increase by submitting unique articles.

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if your article is unique, you can get some huge amount of traffic, but if it is not quality, it will be waste.

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I thinks its better for you if you can get backlinks from writing unique articles of different article submission sites.

Unique content will be increase your site reputation, either its article or bookmarks.

Hey! why do want to copy from others, It's very harm full for your web site according top google panda update.

You know what? This is the only thing which Google hates the most!!

Yes,you will get 2 benefits by posting one content.

unique content will be better

always unique content, it will increase your site popularity on different search engines

It is not bad, but you should make your own description about your article. Do not get a portion of your article that has already been posted in your website and make it as a description for Google might consider it as duplicate content.
So better to make your own description but make sure that the relevancy remains.

Yes, it is safe. You can also use the original url of your article

unique content will always increases your site popularity on search engines

You can submit the same in different social bookmarking sites. But it would be more appreciable if you spin the articles and then go for the submit.

Social bookmarking is a good way of spreading your article. However, you should not make a duplicate description of your article. You should write your won description of what your article is all about before you do social bookmarking.

Different articles on different websites