Kidzworld is a fun, safe place for kids to talk and make friends with other kids. The few restrictions and rules are clear and designed to keep the kids safe. Responsible adults moderate the boards and chat room. Chat is only open during certain hours and a moderator is watching the whole time. Pictures must also be approved before other users can see them. No e-dating is allowed ever.
For extra help, Kidzworld also gives helpful, mature users the status Jr. Mod. They can lock boards inappropriate board topics, and help out a lot around the site. Any user can report inappropriate content to the mods or admins.
On the fun side of the spectrum, it's a great way for kids and teens to make friends and learn about social networking. There are a lot of nice people to be found, and the boards offer interesting or just fun random discussions. The occasional quiz is interesting and the customizable profiles (also moderated) are fun to tweak.
I'm not saying it's all kittens and rainbows. Yes, there is some information and discussion on puberty, but the boards where this usally takes place (Boy's Only/Girls Only) can't be accessed until users reach a certain age.
Still, as we all know everyone has different standards, and content that some people may find offensive can sometimes be found. For users, say, about 10 or older, it's mostly all okay.
For users under that age, it really depends on the child and what parents personally find offensive. With proper supervision from an adult, this really shouldn't be an issue. Kidzworld is very safe, but they can't censor everything.
I repeat, as long as kids are supervised, all should still be well. I would highly recommend this site. It's a lot of fun, and there are awesome people to meet. I've never had problems, and the mods and admins work hard (and succeed) to keep things safe.