My academic colleague, Dr. Jon Becker, and I are working on an online school law guide for NASSP. As part of that process, he and I put a list of topics to be covered up on a wiki for some of NASSP's reviewers to see and comment upon. One of them said that her school district server didn't like the wiki being hosted by wikispaces and posted a warning that it left the server more vulnerable to hackers. That sounded kind of goofy to me. Can someone explain to me how an externally-hosted wiki can increase a school district server's vulnerability?