Given the keyword includes "Facebook", this is likely about social media content. "Eteima thu naba" might be a phrase meaning "younger sister's message or statement"? "Thu" could be a shorthand for "thugak" meaning "post"? Not standard.
: To bypass public scrutiny and maintain privacy, much of this content is hosted within closed or private Facebook groups. Membership often requires answering entry questions or gaining approval from an administrator. eteima thu naba facebook nabagi wari