How to Create a Private or Public Channel on Telegram? The optimal dimension of the avatar on Telegram is 512px by 512px, and itโs recommended to use PNG format to deliver an unpixelated avatar. 3How to create a Telegram channel? The SUCK Channel on Telegram, with a message saying some content has been removed by the police. Photo: Telegram screenshot. A vandalised bank during the 2019 protest. File photo: May James/HKFP.
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