A vandalised bank during the 2019 protest. File photo: May James/HKFP. 1What is Telegram Channels? Telegram channels enable users to broadcast messages to multiple users simultaneously. Like on social media, users need to subscribe to your channel to get access to your content published by one or more administrators. 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. ‘Ban’ on Telegram
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