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This is our first lecture
on text analytics.

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We'll discuss how can
use data from Twitter

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and turn them into knowledge.

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Twitter is a social
networking and communication

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website founded in 2006.

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Users share and
send messages that

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can be no longer than
140 characters long.

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It is indeed one of the
Top 10 most visited sites

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on the internet.

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It had an initial
public offering in 2013,

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and it's current valuation
is about $31 billion.

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Let's discuss the
impact of Twitter.

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Protesters around the
world use Twitter.

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It had an important
impact on Arab Spring.

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People also use it as a
method of notification

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for natural disasters and
for tracking diseases.

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Celebrities, politicians,
and companies

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connect with fans and
customers using Twitter.

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Everyone is watching.

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To illustrate this
last point, let

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us discuss a tweet
that was supposed

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to be from the Associated Press.

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The Associated Press
is a major news agency

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that distributes news stories
to other news agencies.

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In April 2013, someone
tweeted this message

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from the main AP
verified Twitter account.

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It said that two explosions
in the White House and Barack

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Obama is injured.

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The S&P 500 stock index
fell 1% in seconds,

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but the White House
rapidly clarified.

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Many companies maintain
online presences.

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Managing public perception in
an age of instant communication

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is essential.

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Reacting to changing sentiment,
identifying offensive posts,

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determining topics of
interest are indeed crucial.

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In this lecture,
we'll see how we

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can use analytics to
address these questions.