a Smart, Socially Connected Address Book, No matter where you are, at home or on the road, access your address book safely and securely. All your contacts, anywhere. Plaxo tracks feeds from Twitter, Facebook, and dozens of other sites, so you're already in the loop when you need to get in touch.
kikin is a browsing companion that brings relevant content to the user based on their personal preferences and favorite websites.kikin categorizes the content you like and uses those categories to present content and advertising to you; kikin's ability to present relevant content to you continues to improve the longer it is installed. Your kikin profile is stored on your computer.