The best closing statement for the text is:
"In the words of Oscar Wilde, 'Be yourself; everyone else is already taken.'"
This sentence effectively encapsulates the main theme of the essay, which discusses the dangers of conformity and the pressure to present a constructed personality on social media. It encourages individuality and counters the notion of groupthink that the essay critiques. The other options either focus on the awareness of social media's impact or offer a quote that does not align well with the central message of the essay.