One common story that we see on social media is that a celebrity has just died. If we care about the person, we will often comment on the story or share it with others -- but, before you do this, you will want to verify that it is not a hoax.
Here's an example of a news story, claiming that the actor Keanu Reeves has died (spoiler alert: he hasn't):

With articles like this, that come from unfamiliar sources, it is vital to find better coverage. When a celebrity dies, or with any major news, the story is covered by multiple sources and easy to verify. Simply perform a Google search (just type in the main subject--in this example: Keanu Reeves) to see if any other reliable news organizations are reporting the same information. If you can't find better coverage, chances are that the story is not true.