Administrators 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. With the administration mulling over limiting access to doxxing groups, a prominent Telegram doxxing group apparently went on a "revenge spree." To upload a logo, click the Menu icon and select “Manage Channel.” In a new window, hit the Camera icon. Each account can create up to 10 public channels
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