Final answer:
The best evidence that social media use may increase narcissism is the creation of an idealized online persona on platforms like, exemplifying narcissistic tendencies amplified by new media.
Step-by-step explanation:
The fact that provides the best evidence that social media use may increase narcissism is described in the sociological concept where individuals use to tailor an online persona that only showcases their ideal self. This process exemplifies narcissism that can emerge through new media, as users carefully curate their online presence to reflect a perfected image. Furthermore, some sociologists argue that extensive media exposure leads to narcotizing dysfunction, a phenomenon where people become so inundated with information that they become passive, leading to a focus on self-promotion rather than meaningful action.