Rear wheel movement..this looks bad.

If you watch the video, the tire does not move different than the body moving. Looks to me like it is maybe the other side or something in the rear suspension. I see no wheel bearing issue.

Have someone shake it while you look un der the car.
 
double check all your suspension components. panhard bar could be a biggie here, because is seems as if when the car moves side to side, the sound continues until the car completely stops moving. i would start with the components first, then start thinking of other areas. c clip axles do have a bit of movement, but it should not be making noise like that.
 
also, pull the wheel and see if the axle moves like that. if it does, the c clip probably is loose, missing, or broken. the caliper would be the only thing holding the axle in the car right now. :eek:

you may see a problem similar to this if the c clip is not installed properly.

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My car makes that exact same noise when I go over a bump. I was thinking it could be my sway bar loose. I just realized that you were shaking the rear wheels. My front wheels make that noise.