My two cents! I like to make sure that I create a cover photo that looks different from the main group. If it could be thematically linked to the subgroup topic, all the better. And of course, an icon for feed and for mobile display.?
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You wouldn't want someone to post online in the wrong group. And I would use real words for your subgroup name.?
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And you can even make categories for subgroups if you have several.
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Frances
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Frances