Stories like this are called 'fake news' and they can be a problem.
Could you spot fake news?
The first kind of fake news is deliberate lies - which can make people believe things that are completely untrue.
The second kind is when a story is published without the proper checks to make sure that it is 100% true. When mistakes show up in one place, people might start trusting everything they read less.
Everyone tends to share stories and articles they agree with. So if people share fake news and lots of others believe it, it's easy to get sucked into a bubble that is a completely different from the real world and a long way from the truth.
Newsround put a group of school children to the test to see if they could spot fake news.