Public channels are public to the internet, regardless of whether or not they are subscribed. A public channel is displayed in search results and has a short address (link). 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. More>> To delete a channel with over 1,000 subscribers, you need to contact user support Some Telegram Channels content management tips
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