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. Earlier, crypto enthusiasts had created a self-described “meme app” dubbed “gm” app wherein users would greet each other with “gm” or “good morning” messages. However, in September 2021, the gm app was down after a hacker reportedly gained access to the user data. Concise Telegram Android app: Open the chats list, click the menu icon and select “New Channel.” 5Telegram Channel avatar size/dimensions
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