Some of them (either directly or through their agency) have expressed an interest in answering their fan posts. They are aware of your posts, but have not yet responded. I'm sure they are very busy, so just be patient.
Also, we would encourage everyone to reach out to other sites that celebrities might visit to let them know about the new celebrity section on KidzTalk with a link to it. We want to make it a place for celebrities to connect with kids, but it takes time.