I would like to customize the standard large icon sharing widget on Addthis to allow a pinterest Icon.
I noticed there's a Pin-It button - http://support.addthis.com/customer/portal/articles/381237-third-party-buttons#pinterest-pinit
But this requires a specific Image URL.
I'd like the standard addthis sharing widget to allow for Pinterest and a generic sharing utility so rather than specifying a image I can just place it on a page and like the Pinterest Bookmarklet clicking it allow me to select from any image on the page to pin.
Yes, but you need to configure your Open Graph image tag in order for our Pinterest button to know which image to share. More information on Open Graph tags is available here: http://developers.facebook.com/docs/opengraph/