How to Create a Private or Public Channel on Telegram? A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP. 1What is Telegram Channels? The optimal dimension of the avatar on Telegram is 512px by 512px, and itโs recommended to use PNG format to deliver an unpixelated avatar. Developing social channels based on exchanging a single message isnโt exactly new, of course. Back in 2014, the โYoโ app was launched with the sole purpose of enabling users to send each other the greeting โYo.โ
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