Grazr has introduced the Twitter Reader in August. Today it is their ‘tool of the day’. It allows you to browse the social graph starting with a Twitter user.

Drill down as many levels as you want. Why stop at just six degrees of separation? You can jump from friend to friend to your heart’s content.
Find new people to follow. As you navigate through various networks of Twittter friends you can easily visit their Twitter page and add them to your own list of people to follow. It’s a great way to build up your own Twitter network.
Search for any Twitter user. The Grazr Twitter Reader has a built-in search function that lets you browse the social graph of any user. Just enter a Twitter username and an entire network appears.

It’s interesting, but I don’t see the value right now. Kudos to Grazr for stepping in this direction. Baby steps towards PeopleRank.