The original poster found it on a Swedish forum here:

Vad är det här? - Flashback Forum

We have been trying to figure out what the heck is going on and we have come up with some theories. I wanted to post it here to give you guys a chance to take a look at this.

Some are saying this is another ARG in the making as this is the first video by the user on youtube.

ARG is short for Alternate Reality Gaming, a game where you play in real life that somehow connected to some sort of event that will be realased in the future. For example the most famous ARG is currently was called iluvbees where Halo 2 players all over the US went around the country picking up calls at phonebooths in particular locations at certain times. This would eventually lead to a backstory story of what happens on Earth between Halo 1 and Halo 2

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