Knowit is a site I just found out about thanks to Technology & Learning. This is a site that is ideal for curating the web and sharing w/ others exactly what you know about any given topic. This site lets users save any kind of media (audio, video, photos) and then comment/post on it. A person can create a collection of resources, organize them, and even create a digital portfolio for others to see.
I highly recommend checking out Knowit by clicking here!!