The more you publish, and the more sites you’re on, the better.
Simply having a presence on multiple sites and spraying your content as much as possible won’t work. Yes, more content is better because it gives you more valuable social media fodder, but you need to make sure all that content is high quality; otherwise, people will see straight through the crap. Unfortunately, people are getting overwhelmed with more and more content. This means the bar for remarkable content is starting to rise, and to be successful, you need to make sure your content reaches that high bar.