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. Developing social channels based on exchanging a single message isn’t exactly new, of course. Back in 2014, the “Yo” app was launched with the sole purpose of enabling users to send each other the greeting “Yo.” Telegram Android app: Open the chats list, click the menu icon and select “New Channel.” Content is editable within two days of publishing How to build a private or public channel on Telegram?
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