What's the proper etiquette for responding to Facebook wall posts on your birthday? Do you respond to all of them? Write a status update saying “Thanks, pals!” Ignore it completely?
This is the eternal question of our time, second only, perhaps, the one about whether it's really impossible to lick your own elbow. Unless you have 10 friends, the prospect of replying to every single birthday comment can be daunting indeed. You can deal with it a few ways, the best is probably some combination of what you describe in your question.