Drupal and COPPA: How does the Children's Online Privacy and Protection Act affect Drupal?

My company has built several kids sites and we've run into a lot of interesting problems due to COPPA in the United States and we've devised solutions for all of them. While I'd like to talk about those solutions and how Drupal 7 makes things easier for Drupal-based social networks, I'd love to hear what others are doing in this space.

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