In browsing through both sites, I prefer LinkedIn. I feel it is more on the professional side, where Plaxo was not. LinkedIn gives a person assistance in creating a portfolio and other links that will assist them professionally. I know more people who are LinkedIn than those on Plaxo. I also believe that these sites would be used more by people who are searching for a new job. I am perfectly happy here on my little island of Guam, so do not really forsee me utilizing the sites much.