Part of a recent project was to take an HTML 5 Canvas Image and post it to Facebook and Twitter. Although this sounds pretty straightforward, the challenge was that there would be no image saved to the server. I couldn't just slap share buttons on the page, because share dialogs expect content that already exists on a server. Using Facebook's API and Twitter's API we are able to share rich dynamic content. Here's a guide on what I did... (PHP, Javascript, jQuery, TwitterOAuth)