Vikido

This resource styles itself as "a safe, child-friendly environment so that your children can join the conversation." It's designed to be child and adult oriented, so that children as young as 4 or 5 can use it to share pictures, words etc with grandparents or anyone else their parents or guardians deem appropriate. I've not registered so I can't comment, but if you're a parent and interested, I'd love to have your comments. Of course, since it's a site for children it makes sense to try it out yourself first - but you didn't need me to say that really did you!