I love facebook.  I think it is a great networking tool, but I think too many people don't use it the way they should.  I set up a group about a year ago and have over 70 fellow Realtors from my company around the country in that group.  I have posted to the blog, and comments in that group and no one has responded or taken the time to write their own, thus, making the group pointless.  So far I have found AR to be much more helpful in connecting to fellow Realtors.  I think if properly utilized, facebook could be a great tool.  Until then I will keep using it to keep in touch with friends from college.