In the context of your thesis statement, which focuses on how taking care of a pet can enrich a person's life, the information that is least relevant to include would be:
4. Pictures and videos of pets doing funny things are popular on social media.
While this point may be interesting, it does not directly contribute to the argument that caring for a pet improves a person's quality of life in the same way the other points do. The first three options directly relate to the emotional, practical, or therapeutic benefits of pet care.