Personal computers made accessing information a lot faster and easier but a lot of times the things we see when we search information is tailored to our personal beliefs and opinions. For example, if you're a person that commonly searches for information or products about dogs, you're way less likely to get an add promoting cat food. While this may seem like a very positive thing, it also may have a downside. This rule also applies to things like political views, if you're a trump supporter you'll most likely end up seeing things that are pro-Trump and a lot fewer things that are pro-Hilary.
This can skew people's outlooks on certain subjects, if you're only ever seeing web pages and articles saying that Trump is great, you won't ever see the opposing side which is essential in making a well-informed decision about a candidate for the presidency or any other subject for that matter.
In summary, You have to see both the good and bad side of something to truly make a choice and the way the internet works can sometimes make that difficult.
