With the 62.80 update to the game, the map feature has been removed, so you can no longer see the previous levels that you've played, or see your Facebook friends progress relative to your own. You should, however, still see friends that are playing on the same level.

Although the map feature has been removed, the game does allow you to replay older levels in the Elite Challenge! This event appears once you've finished with the levels in the current update, and allows you to replay old levels and win prizes!