Answer:
#1 - Media sources are not always credible. That's a fact. With the media, there are millions, even billions of people who can put their opinions and knowledge, or lack thereof, on the internet. From there, it's an easily obtained piece of information that may or may not be true. Putting it on some sort of site that allows it to be shared over and over can change the way it's viewed. It's a large issue, because so many young people today spend their time surfing the web, and become desensitized to false information. They don't feel like it's important to check their facts with an actual credible source, and that leads to issues in their knowledge.
#2 - People online will construct articles and pieces on on internet that fit what may or may not be trending. On the internet, everything is about trends. What's going on now, what's going on tomorrow. There are ways to manipulate what you're reading, making you believe every word of what's being written. An individual online may be able to see who or what you support based on simple information on an account, and from there it's as simple as saying what you want to hear. It might not be true, but it's sounds just good enough that you'd believe it.
I'm not claiming this is correct, or meets your teachers standards, but I hope it does!