Two linkshells I see are http://ffxiv-roleplayers.com/showthread.php?tid=19690 and http://ffxiv-roleplayers.com/showthread.php?tid=19971. The former was recently posted in a couple of days ago.
Doing a quick search on the lodestone said that Coeurl Open RP is the most active RP Linkshell with 'RP' in its name.
Doing a quick search on the lodestone said that Coeurl Open RP is the most active RP Linkshell with 'RP' in its name.