It seems a little far-fetched, or does it? Many people rely on social media for their news source these days, and people learn about important events, deaths, and more through social media before the news programs air their broadcasts. The story asks people to take responsibility for their responses when it comes to using social media--to check their sources and not just idly retweet and spread a message without knowing for sure if it's true.
However, something like an April Fool's prank can go viral in a matter of minutes because of how fast and accessible social media is. The book asks you to take a look at an extreme example of social media getting out of control and doing some real damage.
While some of the events seem to be over-reaching as to what might happen in the real world, the prose is eerily realistic, sounding almost like a news report, throughout the book. For $0.99, it's a pretty good read and it definitely makes you think about the role of social media in society and how it affects people's perception of the world.
In one respect, I agree with the book: people need to take responsibility for their actions, especially if it was prompted by something that isn't necessarily true, like a (SPOILER) hoax tweet.
Think before you speak, and tweet.