abstract:Openbook was a Facebook-specific search engine, built upon Facebook's publicly available API, which enabled one to search for specific texts on the walls of Facebook subscribers en masse which they had denoted, knowingly or unknowingly, as being available to "Everyone," i.e.
Pay attention to certain keywords (such as a product, business name, etc.) and keep tabs by utilizing a service such as Social Mention (socialmention.com) or Openbook (youropenbook.org).