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A group ( often termed as a community , e-group or club ) is a feature in many social network service s which allows users to create , post , comment to and read from their own interest - and niche-specific forum s , often within the realm of virtual communities .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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