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Today in History: Jack Dorsey sends first tweet on Twitter

3/21/2026

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Summary

Story summary

On March 21, 2006, Jack Dorsey sent the first message on Twitter, marking the launch of the platform. Initially designed for short text updates, Twitter quickly grew into one of the largest social media networks, allowing users to share messages, images, and videos, and engage through various features like direct messaging and community interactions.

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Story summary

On March 21, 2006, Jack Dorsey sent the first message on Twitter, marking the launch of the platform. Initially designed for short text updates, Twitter quickly grew into one of the largest social media networks, allowing users to share messages, images, and videos, and engage through various features like direct messaging and community interactions.