From the website:

MatMice is an invite only place to connect with your friends.

Create a custom profile, upload & share pics,
write blogs & comments, and more.

My kids have their own web pages, and do not give out any personal info. They also linked to my familyzip page! If you want to check out my kids' pages, here they are: http://pages.matmice.com/home/dostuff/ and http://pages.matmice.com/home/kidscentral/ You can read their pages and read their guest book, but you can't interact with them unless you register. The kids have been having fun with this today, and are looking forward to finding new friends at the site..