I wish to pass an image with my shared url but the image to be passed is not known when the page is loaded (and hence the meta tags are read). Basically my page is an html5 canvas art tool, and what I want to have happen is: when the user clicks save image, a temporary file is created for use in the addThis sharing process, and then the temp file is deleted.
Is this possible? If so, what are my options? Thanks!
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