追記: どうやら具体的にはGoogleが提供しているGoogle Maps Mobile 3.0をインストールした携帯電話が「発信器」になって自分の位置を常に「あちら側」(クラウド)に流し続ける、といった感じ?のようです。 Google Latitude: Share Your Location with Friendsによると After selecting yourself, you can: - Change your status message across Google products. Your status will only be shared with your current Google Talk or Gmail chat friends. - Change your photo across Google products. - Submit or edit your phone number in Latitude for your friends. - Edit your privacy settings for all friends.
After selecting a friend, you can: - Show the friend in map view. - Search for places near your friend. - Call if a phone number is available in your Google Contacts or Latitude. - Chat using Google Talk or Gmail chat if available. - Send an email. - Get directions to the friend's approximate location. - Set sharing options. You can choose to hide your location or share only city level location with individual friends. - Remove the friend. Your friend cannot see your location and you cannot see the friend's location. と書かれてある。 ざっと訳すと