The optimal dimension of the avatar on Telegram is 512px by 512px, and itβs recommended to use PNG format to deliver an unpixelated avatar. 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). Telegram Android app: Open the chats list, click the menu icon and select βNew Channel.β Telegram iOS app: In the βChatsβ tab, click the new message icon in the right upper corner. Select βNew Channel.β Unlimited number of subscribers per channel
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