fyi.opensocial.getSiteRecord

One public record a group's site reads, by URI, from the host's index: of a collection the site reads from everyone (answered to anyone), or the group's own or a member's of a collection it reads (a member's to members only). Anything else isn't the site's to read, except to whoever may change the site, for whom the host reads it from the account's own server: what a tab is about, when it's made.