How to Create a Private or Public Channel on Telegram? A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP. Unlimited number of subscribers per channel Today, we will address Telegram channels and how to use them for maximum benefit. The optimal dimension of the avatar on Telegram is 512px by 512px, and it’s recommended to use PNG format to deliver an unpixelated avatar.
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