As mentioned above content is king. The ease of readability plays a major role for the success. Articles with Images, Lists, Data and stats do best with social media website. If you writing along article make sure you break it in proper category so that reader can easily navigate the article. An example is this article. Should I submit article now? If you are an active member if your target social media website then submit your article else best advice will be PM (email) any top user from that social media website and ask them to submit. Everyone loves to submit quality stuff.