Click on the links below to get started:

Flickr : Home to over 5 billion of the worlds most interesting photos.
SlideShare : A cloud service that allows eLearning professionals to view and download presentations & documents on topics that interest them and remix for their own work.
SoundCloud : The world’s largest community of sound creators.
YouTube : Last month, YouTube received a substantial overhaul. In the new interface, you can organize your videos into playlists with ease.