There are a few techniques you can use to spread out and get your content out there.
1. Email bloggers and tell them about your content
2. Share it on bookmarking sites (like Reddit)
3. Contact influential Twitter and Facebook profiles about it
4. Make it easy for visitors to share your infographic with an embed code at the bottom
5. Share it on infographic websites (like https://www.prizebondtime.com)
6. Share it with your email subscribers (if you have an email subscriber list)
7. Post it on your blog, Facebook page, Twitter, etc. Basically everywhere.
The name of the game here is to get your content out in front of as many eyeballs you can as possible.
Then after that, it's up to how good your content is to begin the viral loop.