How to build a private or public channel on Telegram? 3How to create a Telegram channel? 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. A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP. A vandalised bank during the 2019 protest. File photo: May James/HKFP.
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