Evidence based on personal observation is considered anecdotal evidence. Anecdotal evidence is best used when disproving a claim, since a single observation can contradict a particular argument. However, it can be dangerous to use anecdotes to support an argument, since it is a bad idea to draw a generalization from a single example. For instance, if you know a teenager who doesn't have a social media account, it could be a useful anecdote to contradict the claim that all teens are addicted to social media. It could not, however, be used to argue that social media is not a problem for many teen