Google is all about social collaboration this week. After launching Sites, we see an update to Google's recently launched My Library. You may recall that this personalized library tool acts somewhat as a bookmarking service that aligns with the Google Book search online.
In getting some useful interaction going, Google has added the ability to put another user into your Favorites, so you can easily access those users that you've found to be helpful. It's an indirect recommendation tool that should come in handy for some, but if you're like me, you'd prefer an automated process for this new option.
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One thing I find particularly daunting in services that rely on my building up some sort of personal collection (whether it be for books or music, or any other preference-based collection) is taking the first steps towards building up the collection, and finding other users that have already built up useful collections.