I would agree with you except that a person who re-tweets or posts crap like this give it a bit of an endorsement....and a celebrity endorsement is a big thing. Just look at some of the RIDICULOUS SHIT that has sold simply based on a celebrity endorsement....power bands? Skechers Shape-ups? ThighMaster?
See the point?
Watching the video and saying, "HMM...that's interesting I think I'll develop my own opinion." That's free-thinking and healthy skepticism. Posting it and saying, "Extremely interesting must watch video" is absolutely an open endorsement.
You say shark I say hey man, Jaws was never my scene and I don't like Star Wars