Commoncraft has done it again (i embed several of their explanation videos in the past). Their style of explanation is phenomenally simple and yet effective. As simple and effective as generating clones like this TV ad.
This time they come up with Social Media in Plain English. This video focuses on basics of social media: new technology that makes everyone a producer and tools that give everyone a chance to have a say.
They also offer downloadable versions from all their video products that are high resolution and licensed for use in the workplace in the Commoncraft Store. Above video transcript is also available here.
Expect for their influence more on how mainstream internet users understand the Web 2.0. in the future.