Right now Google loves Pinterest and is passing a huge amount of SEO value to it.
If you are not on Pinterest, getting on there to pass SEO is a strong reason.
If you want advice on how and why you can create strong visuals, listen to this podcast and read the blog post:
There are a lot of great visual marketing resources there. Take advantage of Pinterest for SEO while it still works… Google changes things all the time. So get pinning!