I am all for a system for only receiving tells from people on your friends list. It should be an option we can turn on and off. I think this would be the best way to handle this growing problem. As for the time being I just set myself to /busy I've let people in my FC and Linkshells know if they want to /tell me something to let me know in FC or Linkshell chat so I can unbusy myself. It is extra work, but it is the best solution for now. It would be nice though if we could take off the busy status while in a dungeon/raid.