atomicbetty334 is an AGTube channel owned by Jamie. She created her channel on April 15, 2009 (though she didn't start posting until June 2010) and has over 3,700 subscribers. She makes mainly AGSMs and AGMVs, though she is currently more active on her Instagram.
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YouTube: https://www.youtube.com/user/atomicbetty334/
Instagram: https://www.instagram.com/leahchatt/