That's right, FOP is am anonymous program, so the cruise line has no way of knowing who those people are. But wjhat you CAN do is go to the first FOB meeting, meet your fellow FOBs and make arrangements for all to meet in the anytime dining room at a preset time every night.
Some people may not want to take their FOB affiliation that far, but many are very friendly, I hear. It's a good reason to get cabin numbers so you can call them if you need to talk to someone.
I am the editor, but I also speculate, ask questions and play devil's advocate. I reserve the right to change my mind.