Hotel Social Network

Here's a concept I haven't before seen reduced to practice: a "social network" in which random occupants pull down shades both to identify with an assigned room and signify they have turned in.

I suppose they are not following the Facebook or Google policy of announcing a "true" identity, but there is a kind of systemic authenticity here. How do observers from the street comment? They don't. They are like those who follow tweets by SMS but don't post to Twitter themselves.

The hotel is in the Mitte area of Berlin.