Thank you for sharing those videos. The first one is many photographs, and they can be double exposures. The second one does look like dust or other debris falling. The third one is creepy, but can also be a viral video.
Until the original photographs and videos are examined by an expert, it is hard to tell what is real anymore. Most people tend to put their videos on YouTube now, and that is the first red flag to be raised.
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Subject: ghost video links 