Speaking Image (Link) is a web application which allows users to upload high-resolution images, work on them adding information over specific areas of the image and interact, collaborate with other users through standard social network tools.
Its main objective is to provide an online tool for interactive annotation of images, photos online through a simple and functional visual editor, after uploading a picture, you can annotate text and markers, points of interests, geometric shapes, lines, in the form of wiki articles and change the colours of the elements.
Watch the video above which explains the use of this web app. and how to annotate images with it. The site makes it very easy for people to come up with images that can be as informative as they could possibly want through interactive interface. This will be a great tool for educators or for using in presentations to embed visual data onto photos.