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Another use case touted by Twitter: an emergency response tool by government officials and relief organizations, as demonstrated by this Tweet sent by New York City mayor Michael Bloomberg during Hurricane Sandy in November 2012.
Twitter as a real-time, breaking news service. Case in point: This Tweet sent by Twitter user Jānis Krūms immediately after US Airways Flight 1549 landed on the Hudson River near New York City in January 2009.
And let's not forget that being a social network, striking up a conversation is at the core of this platform. What differentiates Twitter from Facebook is that many of these conversations (even between celebrities) are public entertainment for all of us.