There are several ways to find out fake news, one of them is looking for the most trusted news in the Internet and search from different source, from the forum and people's testimonial also can be one of way, fake news could be dangerous for the market, it could divert the investors into the wrong direction
This is correct, you always have to check the source of the news, some are for people to be scared and have to sell their bitcoins quickly and cheaply, the market not only has traps in their operations, but externally move all this News type and so you can influence the price.