Finn Neilsen plays a piano in Brooklyn Bridge Park in New York on June 21, 2010.
2010年6月21日，芬恩·尼尔森在纽约的布鲁克林大桥公园弹钢琴。
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Schroepfer noted that Facebook has 400 million users, over half of whom log in every day, and that Neilsen says that the time spent on site for Facebook is greater than for the next 6 sites combined.