What do you mean by "In terms of links, alot get linked to the home page as the source and some to the image url."
Do you mean that due to an infographic on an internal page other sites often link to the homepage of the infographic owner?
Also, as I mentioned I was surprised, as you can see from the amount of the social shares this infographic did had ncie buzz (maybe still does). However the amount of links I could locate is ok nothing more and also the PA by MOZ OSE is only 28... Looks weird to me. Makes me wonder...