Week 8: Thing 19 - LibraryThing vs Shelfari

I'm quite familiar with LibraryThing. I created an account last summer and explored it at length during a summer workshop I had with the Reading Specialist and English teachers. We created a group for our high school. Our hope was for students and teachers to post book reviews to share among each other. However, we immediately ran into a glitch: you can not list books read by just a particular group - bummer. We figured that perhaps a work around would be for the reviewers to tag their reviews with our school name. But still, this does not let us view book reviews just of our school.

So, that is why I now use Shelfari. It is much more conducive for collaboration and just seems more user-friendly. I'd be curious to know how others feel. Anyone else out there who has tried both LibraryThing and Shelfari? And how about GoodReads? I've gotten a couple of invitations to join, but can't justify adding yet another online library database to my collection. Any thoughts?