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. Write your hashtags in the language of your target audience. A new window will come up. Enter your channel name and bio. (See the character limits above.) Click “Create.” You can invite up to 200 people from your contacts to join your channel as the next step. Select the users you want to add and click “Invite.” You can skip this step altogether. Add up to 50 administrators
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