Confusion about subgroup definition #Germany

Sam G.
 

I understand the value of consolidating the "main" JewishGen email blast and identifying topics by hashtags.
However, what does the "Subgroups" term in the sidebar indicate? Who has authorization to create a "subgroup" for discussions that heretofore happened under the "gersig" special interest group?  Does the #Germany hashtag subsume the gersig discussions?

Amnon Gronner 
JewishGen Researcher  614413
 

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