Google Reader API Linking reader's User ID to a Google Account

I am developing a web application that heavily utilizes RSS feeds.

I have found you can query Google to get statistics and analytics on your RSS Feed (very useful, if you administer RSS feeds, you should check it out! Retrieving Google Reader stats for RSS feed and items)

Now that I have a method to determine a list of Google Reader User Ids that like a feed item, I would like to know how I could use this User Id.

Specifically, is there a way开发者_JAVA百科 I can link a User Id to a Google Account - if they are logged in through a web interface like Stack Overflow does?

If this is not possible, what public information can be gathered about a particular Google Reader User Id? Is there documentation on this API? (note, I am not looking for Google Reader API, which, from my understanding, allows you to build your own RSS Reader)

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Try http://www.google.com/reader/api/0/people/profile?u=14290265284323789574