Invite up to 200 users from your contacts to join your channel Add up to 50 administrators 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. Find your optimal posting schedule and stick to it. The peak posting times include 8 am, 6 pm, and 8 pm on social media. Try to publish serious stuff in the morning and leave less demanding content later in the day.
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