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. End-to-end encryption is an important feature in messaging, as it's the first step in protecting users from surveillance. 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." To delete a channel with over 1,000 subscribers, you need to contact user support Hashtags
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