I need to replace all the default functionality for sharing videos and images.
I want it to be automatically embedded like facebook.
If its a video from youtube or popular video site, it should populate description and title and cache thumbnail if possible.

there is many social network scripts that have this available, oxwall should too.

There is already free php classes for doing this, if anyone is interested in trying to make this possible.
http://autoembed.com/about/