I can remember a similar accusation being levelled some time ago, and then as now, I wondered how we can know for certain as our anonymity should not reveal personal details of ethnicity/religion/sexual inclination unless we wish to disclose these facts on, for instance a profile page.
At the time reference was made to photographs posted on site or on the profile page, again this could be random and cannot be taken as a guaranteed statistical basis.
I don't remember seeing a single non white one, though I am relying on memory.
The complaint at the time was
"I would welcome a lot more diversity on gransnet too. Gransnet has barely any diversity."
Apart from a common identity as grandparents (even then not 100%) I get the impression that our membership covers a broad spectrum of ages, political persuasion, religion or not, nationality, educational background , marital status or not. If there is a bias towards being computer literate and articulate, that is self selecting.
You cannot impose inclusivity or diversity, but I maintain GN is open to all, regardless of colour, creed or politics.