Weird political rules

I'd love to get to the bottom of this little tidbit from the Fontana City Manager's new blog, Fontana360. It's good to set the ground rules at the outset, and Ken Hunt is doing just that with his new blog. Some of the items are mere common courtesy ("No personal attacks"), but this one is, at first glance, a little mystifying:

All public officials subject to the Brown Act and/or other open meeting laws must identify themselves and must not post comments if comments have been posted by two other members of the body in which they serve.

The first part isn't mystifying - the Brown Act is commonly cited as a way for politicians to be transparent - but where did this "two other members" thingie come from? Do comments from three members of the same body constitute an official meeting or something?