Developing social channels based on exchanging a single message isn’t exactly new, of course. Back in 2014, the “Yo” app was launched with the sole purpose of enabling users to send each other the greeting “Yo.” A vandalised bank during the 2019 protest. File photo: May James/HKFP. Channel login must contain 5-32 characters Activate up to 20 bots Unlimited number of subscribers per channel
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