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. But a Telegram statement also said: "Any requests related to political censorship or limiting human rights such as the rights to free speech or assembly are not and will not be considered." How to create a business channel on Telegram? (Tutorial) How to Create a Private or Public Channel on Telegram? Some Telegram Channels content management tips
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