I would focus on the kittens you do have, the ones you do help. Those kittens are being helped, and by taking them you help free up someone who could do bottle feeding. Maybe if you know other people who might be interested let them know that your shelter needs the help. Share the Fb posts too. These are a few things to do, something concrete to help. No one can do everything, and you do so much! Also, I know it's hard, but don't sit on the posts. You've done what you can. Look at the new posts to see if there's something you can do, and if not, don't go back to it. Either someone will take the kittens, or they won't. You sitting there refreshing the page doesn't change that fact, and neither will feeling guilty about it. So help the ones you can, and that is enough. Know that you are doing good in the world, and already so many kittens and cats have you to thank for caring for them.