Mojiti, different from YouTube and others, because it allows direct manipulation of the objects (adding content to videos and still being able to display them online, with the new added user data). Also, it can fetch videos stored in Youtube and others which is a great example of interoperability:
"(...) personalize any video. Use Mojiti Spots to narrate your personal videos, add captions or subtitles in any language, or just comment on any scene to share your thoughts and opinions."
