Step-by-step tutorial on desktop: How to build a private or public channel on Telegram? 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. Don’t publish new content at nighttime. Since not all users disable notifications for the night, you risk inadvertently disturbing them. A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP.
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