Hashtags 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. How to Create a Private or Public Channel on Telegram? Telegram Android app: Open the chats list, click the menu icon and select “New Channel.” A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP.
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