I am happy to announce that my excellent app developer, OCG Studios, is a Founding Member of the Moms With Apps KWI (Know What’s Inside) Program, created to let parents (and educators, librarians, etc) know what is in our apps. We will be allowed to use the badge (kind of like the Good Housekeeping Seal of Approval) on our apps and website, because we comply with the COPPA requirements for children under 13 years old, follow Best Practices for Children, and are a developer member of MWA. Moms With Apps has clear understandable (read: not legalese or too jargon-y) info on their site.
Here are some straightforward answers re COPPA (although it mentions apps in particular, it applies to websites too): http://www.act4apps.org/coppabasics/
Here are some FAQs from the Dept of Justice site: http://www.ftc.gov/tips-advice/business-center/complying-coppa-frequently-asked-questions (The Federal Trade Commission oversees the actual law.)