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I have used Marcus P. Zillman as a resource in previous papers for school so I was intrigued when I saw this HUGE list of social informatics and networking websites that he had compiled. He also writes for LLRX a highly regarded Law Librarian e-zine here: http://www.llrx.com/authors/398

Wow, this list is huge. Problem with a list like this is I wonder how often it is managed, to make additions and remove URLs that don't exist anymore.