There are 2 current groups dedicated to making a crab happy, I can't link from my phone but if you go to groups and search crab they should pop up. Only problem is that most of the people have seemed to abandon the groups after getting their badges.
I joined both groups and want to bring attention to them so others can join up and we can make another 50 person happy crab train. I will keep both groups open when online so we can organize an outing?