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Facebook changed the way it displays timelines. Showing information more likely to be interesting to the user instead of just showing everything in chronological order.
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In February of 2017 SnapChat became a publicly traded company for the first time.
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In march of 2018 it became public knowledge that a company called Cambrige Analytica had been purchasing the private information of millions of Facebook users. This information was then sold to be used for advertising as well as political campaigns.