How to Create a Private or Public Channel on Telegram? 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 vandalised bank during the 2019 protest. File photo: May James/HKFP. How to build a private or public channel on Telegram? Hui said the messages, which included urging the disruption of airport operations, were attempts to incite followers to make use of poisonous, corrosive or flammable substances to vandalize police vehicles, and also called on others to make weapons to harm police.
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