Questions for opposing side

Can users opt out of having a public search listing? Yes. All users have several options in regards to the privacy of their public search listings. In addition, we are informing all users that external indexing will occur in approximately one month, so they have time to adjust their privacy settings. All of these options can be accessed from the Search Privacy page.
• Users who have their search privacy set to “Everyone”: Users who currently have search set to “Everyone” will have a public search listing created for them. They have additional options to remove their public search listings from search results on Facebook’s Welcome page, to remove their public search listings from external search engine results, or to do both.
• Users who have their search privacy restricted: Users who currently have search set to anything other than “everyone” have not had public search listings created for them. Their public search listings will not appear in search results from Facebook’s Welcome page or in search engine results.
Who is indexed in these searches? Only users who are over 18 and have the “Allow my public search listing to be indexed in external search engines” checked in their search privacy settings will appear in external searches.
http://battellemedia.com/archives/2007/09/facebook_search_big_move