John Casterline
American content creator, entrepreneur, and social media strategist
- Born
- 25 August 2003
- Age
- 23
John Casterline (born 25 August 2003), known online as H1T1, is an American YouTuber, content creator, entrepreneur and social media strategist. He is known for comedic takes on viral news, and his YouTube channel, 
h1t1, had about 6.81 million subscribers in March 2025. He has received YouTube's Silver and Gold Play Buttons, and he was educated at Florida State University.
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