In Late 2001, Yahoo
Groups decided to delist several adult oriented e-mail subscription groups for which they remain delisted today.
Even if adult oriented materials are flagged and desired, these current active Yahoo groups are not provided in search results of the available Yahoo groups search -- when they used to be and now are delisted.
Several "user supported" off-site listings of these active Yahoo groups with the correct URLs for the group home page and subscription email addresses of course followed.
History: "Yahoo Groups" took over "egroups" which took over "onelist".
No longer single listed, huh? It now has delisted groups from once was the onelist concept.
Delisting does not only apply to Yahoo Groups specifically...