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I always thought double experience events were a bad sign, as they mean that the game needs double experience to play nicely. But whatever. Netmarble/Gpotato/Tecmo-Koei/someone promised double skill proficiency gain for a week if the game got 9000 "likes" on Facebook, and they did, so here it is. It started late last night and lasts a week. If you want to grind for rank in something stupid, then here's your chance. Should save shipbuilders a good bit of cash in leveling.