How to Create a Private or Public Channel on Telegram? More>> 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. The imprisonment came as Telegram said it was "surprised" by claims that privacy commissioner Ada Chung Lai-ling is seeking to block the messaging app due to doxxing content targeting police and politicians. Telegram iOS app: In the “Chats” tab, click the new message icon in the right upper corner. Select “New Channel.”
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