SOE is running a promotion, from December 10, 2009 through February 10, 2010, where players are encouraged to socially network with three of their games: EverQuest, EverQuest II and Free Realms. As each game individually reaches their stage goals, an in-game reward will be unlocked for everyone that plays that game!
Each stage rewards Station Cash, which is in a universal wallet that can be used in any of those three games, so it'd be highly beneficial to pitch in and fan/follow all three games. The 10k and 15k stages also reward in-game items along with the Station Cash. You can read more about this promotion here.
EverQuest: Facebook | Twitter
EverQuest II: Facebook | Twitter
Free Realms Facebook | Twitter