Final answer:
Tori has used the rhetorical device of antithesis in the bolded portion of her speech to emphasize the negative influence of social media.
Step-by-step explanation:
Tori has used a rhetorical device known as antithesis in the bolded portion of the excerpt. Antithesis is the use of contrasting ideas or phrases to create a dramatic effect. In this case, Tori contrasts the idea of constantly moving backwards on social media with the idea of always moving forward in real life, emphasizing the negative influence of social media. This rhetorical device helps to make her point more impactful and memorable.