Final answer:
To investigate the credibility of the source, cross-check the information, and verify it with other sources before accepting or sharing the headline as true.
Step-by-step explanation:
To investigate the credibility of the source, it is important to cross-check the information with other sources to see if there are any corroborating reports or if multiple news outlets are reporting the same event. By doing so, you can get a better understanding of the accuracy of the headline and determine if it is true or not.
Sharing the headline without verifying it is not recommended, as it may spread misinformation or rumors. It is essential to verify the information before sharing it with others.
Ignoring the headline as fake news without proper investigation could also be misleading. It is better to perform due diligence and evaluate the credibility of the source before reaching any conclusions.