Please provide a detailed analysis of the impact of social media on communication in the 21st century. Your response should contain at least 5 paragraphs. Paragraphs are separated with the markdown divider: ***. Highlight at least 2 sections in your answer with markdown, i.e. *highlighted section*. In your response, the word "communication" should appear at least 4 times. At the end of your response, please explicitly add a postscript starting with P.S.

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