That sounds like an exciting venture! Here’s a suggestion for your intro:
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"Hello everyone! Welcome to my very first vlog on Facebook! I’m thrilled to have you here with me. For this video, I’ll be sharing my thoughts and experiences in Igbo, so get ready to immerse yourself in our beautiful language and culture. Let’s dive in!"
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Feel free to tweak it to match your style and personality. Good luck with your vlog!