Remember that yogurt (plain, Greek-style with acidopholus) is good for chickens, but only in moderation. About a tablespoon for every 8 birds, spread out in a flat container (a yogurt lid works very well). Yogurt helps the chickens biuld up their naturally occurring flora. But too much yogurt gives chickens diarrhea. Once a week is plenty.
Don't remember who posted about the chicks hating the yogurt and wiping their faces. That's how they clean their faces, by wiping their beaks on the litter, shavings, etc. That doesn't mean they hate! That's how they'll react to anything that is moist, including suet. If you leve a little plate in with them for a couple of hours, you'll see how it'll be pecked at until gone. But be sure you somehow keep the plate steady (we used duct tape on the underside of the lid and attach it to a brick to elevate it off the pine shavings). If it slides around, it'll get covered with shavings, hay, poop, you name it. I have one chick that purposely used to knock the yogurt container off the brick so no one else would want to eat it. Then she'd drag it across the brooder and eat it all by herself. We remedied that quickly!