4How to customize a Telegram channel? 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. Telegram Android app: Open the chats list, click the menu icon and select “New Channel.” How to build a private or public channel on Telegram? Hui said the messages, which included urging the disruption of airport operations, were attempts to incite followers to make use of poisonous, corrosive or flammable substances to vandalize police vehicles, and also called on others to make weapons to harm police.
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