How to build a private or public channel on Telegram? A vandalised bank during the 2019 protest. File photo: May James/HKFP. SUCK Channel 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. Your posting frequency depends on the topic of your channel. If you have a news channel, it’s OK to publish new content every day (or even every hour). For other industries, stick with 2-3 large posts a week.
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