Telegram users themselves will be able to flag and report potentially false content. A Hong Kong protester with a petrol bomb. File photo: Dylan Hollingsworth/HKFP. 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. Activate up to 20 bots To delete a channel with over 1,000 subscribers, you need to contact user support
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