I too came across Gransnett by accident when I was googling something else.
However, I wouldn't dream of telling my friends I was a member, only my husband knows this.
Also, I like the anonymity, as it's a place to let out all my frustrations, when I'm in pain and know that I will be sure of support. My friends don't really know how chronic my health conditions are, no-one wants to listen to someone moaning all the time and I certainly don't want to waste our time together.
Much to my surprise and delight) I've made some new friends ( and probably annoyed a few people into the bargain), The Edinburgh grans are so welcoming.
Also, I love reading the variety of threads on different subjects.
I suspect GN is a lifeline for many people who are lonely and have little human contact.
The suggestion of a highlighting GN on "Loose Woman " , "This morning" etc. is a good suggestion.
As for being irrelevant to people who do not lead full lives, I can assure you that my problem is that my life is so busy, that I'm having trouble fitting in GN.