I made some comments there, but the chief one I'd like to repeat is that if the library allows the public to post on its blog, and then edits out some comments, depending on other indicators of publisher status, perhaps a court would use publisher liability instead of forum analysis. This would allow a library to make selections and edits, but also opens up the library to liability if there's defamation, copyright infringement etc. I see that at least one library has a "book club" blog .. and perhaps that's the legal analysis that would be used there. I'd highly recommend a library that chooses that route to brush up on publisher liability (you can get books on this at the library) and better yet talk to a lawyer before going full force. Many libraries have always published newsletters, but the visibility by potential plaintiffs is on such a different scale when something's online.