Facebook probably has the biggest reach / ease of use for sharing content. But, casting a wide net and making use of as many platforms as you can is a good idea.
Here are a few others platforms you did not mention that we use regularly:
For infographics and other pieces of visual content: Pinterest
For infographics: The Largest Online Collection of Infographics | Visual.ly
For Slideshow Presentations: SlideShare.net
Here are a few others platforms you did not mention that we use regularly:
For infographics and other pieces of visual content: Pinterest
For infographics: The Largest Online Collection of Infographics | Visual.ly
For Slideshow Presentations: SlideShare.net