Group chat is the widest category here, because almost every messaging product has groups; what separates them is who the group is for. WhatsApp, Telegram and Signal are built for people who already know each other, and their group features optimise for privacy and reach. Slack, Microsoft Teams and Discord are built for organised communities, where membership is managed and channels provide the structure. Reddit and LinkedIn are groups you join rather than groups you are already in. A few, Telegram among them, live in both camps at once. The choice matters less on features than on whether your group is a family, a workplace or a public.
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