How to build a private or public channel on Telegram? More>> 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. Telegram channels enable users to broadcast messages to multiple users simultaneously. Like on social media, users need to subscribe to your channel to get access to your content published by one or more administrators. Telegram iOS app: In the “Chats” tab, click the new message icon in the right upper corner. Select “New Channel.”
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