How to create a business channel on Telegram? (Tutorial) Read now A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP. 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. Ng, who had pleaded not guilty to all charges, had been detained for more than 20 months. His channel was said to have contained around 120 messages and photos that incited others to vandalise pro-government shops and commit criminal damage targeting police stations.
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