All of the links on the pages in our beloved Google group were vandalized, and changed to
videoz4u.com, or something like that. Luckily, Google saves old version of pages, and it is easy to revert to old versions and undo the damage.
However, I've made a change where, to become a member of the group, you have to request an invitation, which involves answering a question. I'll have to manually review each question and request for invitation, but I think that will be less work than cleaning up such a big mess every few months.
Let me know if you have any concerns.