One of my favorite online tools for visibility was Slideshare. It was purchased by LinkedIn years ago, and then it disappeared.
SlideShare was a FREE site where you can upload PowerPoint Presentations. You can add MP3 files to your presentation to have audio along with your visual presentation. SlideShare also works with Keynote.
My primary purpose was to create more visibility for my artwork and to provide additional content links for my website.
An additional benefit was that many (and perhaps even most) of the people watching my SlideShare presentations were discovering my work for the first time.