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watch -> follow
message += content
like,collection -> many to many(user & video)
tag -> part of video,separate by ‘#'
theme&class many to many
https://drive.google.com/file/d/0B2-E8z9MPYbMNnVGQzNEVXdyNVk/view?usp=sharing
https://www.processon.com/view/link/55b7565be4b0e58e84528875