A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP. 2How to set up a Telegram channel? (A step-by-step tutorial) 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. It’s easy to create a Telegram channel via desktop app or mobile app (for Android and iOS): Concise
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