Facebook in 2010-2011- Japan Story

Following is the strangest graph that I have seen on Google Trends. And I have been at it for some time now. So, any one who can help explain the unique almost 80% drop in search traffic for term facebook will be hugely appreciated. I do understand that year Mark Z. was named the Time Person of the year. But if that was the only contributing factor then it would be comforting to see an equally steep rise post the announcement by Time. And needless to say that sudden spurt is completely missing. So, again, help me out here.