Geni Family Tree

Build it and they will come. That's my mantra for creating a family tree. Lori, the same friend mention in the previous post, alerted me to the website www.geni.com which is a utility for creating your family tree. I've started creating the tree and it shows me who from my address book is also registered on the site. Some family members are already using it - are my siblings secretly building a family tree house in the virtual backyard?