To be honest, they could have 2 toggleable options available.
First a "Not looking for FC" toggle, which would auto-dismiss invites and would show that you're not interested in joining a FC in your search info.
Secondly a "Looking for FC" toggle, which would show in your search info that you are actively seeking an FC. In addition, they could also then allow for this toggle to be part of a dedicated search that works globally for use by FC's to recruit AND also open access to a dedicated FC recruitment chat channel, so that FC's would be free to post their advertisements to their hearts content. Maybe even have like a "Marketboard" type thing where FC's can post recruitment posts (With links to their FC details) and players with this toggle can then peruse this and try and find FC's they like the sound of and contact them for more information.
Thus, such a system would reduce blind invite spam (Since, that really annoys me... It's not that I'm against joining an FC, but please, at least try and get to know me a little beforehand y'know?), reduce the chat spam of people posting their recruitment macros and also create a more interactive system to aid FC's and people looking for FC's in finding the right players/FC to join.
