I'm a 74 year old with 3 decades of PC usage but never fully got into the social media thing (maybe a toe but not both feet). I too don't know how best to deploy a hashtag. It's seems quite searchable and I found this site on the general usage.
I wonder though if usage on the JewishGen Discussion Group has specific idiosyncrasies.
I'm a novice in posting items so I'm not sure if this is going only to Shelley or the entire world of JG.
If the latter, maybe some experienced hashtagger could OK the searched article and indicate how it'd work here.
LAUWASSER, WICHINSKY, AARON, COHN,ABRAMOWITZ, rEJOWIEC, SOKOLY