Facebook Connect and Google Friend Connect are the latest social networking services launched simultaneously 2 days ago. They essentially let you register/log into any site using your facebook login or Gmail log in respectively. This means in future, you can have just one super profile page usable in all websites. Its also a great marketing tool for website owners because of the invite feature. Linked, friends can also notice what sites you've been to - great advertisement!

I tried out Google Friend Connect on my blog but did not like the interface. It was, however, very easy to install (just like adsense). You only need to transfer 2 HTML files to your website root. Then cut and paste some more codes to wherever you wish within your home page.

The Facebook Connect is a bit more difficult to install. I gave up on that one after a while although I would have preferred using it.