Wikipedia:Articles for deletion/Eratosphere
I've found four passing mentions of the Eratosphere as "a poetry forum", over a longish period of time. None of these satisfy  since they are just passing references, often in conjunction with mentioning another site, but they do suggest that this website might have a meaningful userbase of some kind. My finds: https://books.google.ca/books?hl=en&lr=&id=lFmtCAAAQBAJ&oi=fnd&pg=PR6&dq=%22Eratosphere%22&ots=5yN9hxCsyA&sig=SlvzgDs8JmNomi_qzgTpXOGSoUU&redir_esc=y#v=onepage&q=%22Eratosphere%22&f=false 1 https://www.firstthings.com/web-exclusives/2019/10/a-conversation-with-maryann-corbett 2 https://www.pbs.org/newshour/arts/poetry/politics-gets-hand-turn-poem 3 https://swarthmorephoenix.com/2014/09/18/on-ian-hoffman-15-from-the-poet-to-the-poetry/ 4
— NONE, NONE
Stance: delete
Cited policy: WP:GNG (Wikipedia:Notability)