There's more solidarity in the group, stronger networks, each engagement is meaningful. So, that means comments can grow into conversations? Yes. Soup, right? Exactly. Read more on groups and engagement.
6 big WHYs: Rationale Behind Social Media Groups And Claim Success In Sales And Branding Without Any Marketing Knowledge
Further, one customer query can resonate with more other customers who will eventually benefit from the answer, instewd of having to arduously respond to individual queries on things that could very well be dealt with once benefiting more people - working smart.