End-to-end encryption is an important feature in messaging, as it's the first step in protecting users from surveillance. 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." Telegram iOS app: In the “Chats” tab, click the new message icon in the right upper corner. Select “New Channel.” How to Create a Private or Public Channel on Telegram?
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