10 in each category. 30 well-thought targets what you really hate. And everything else, what you don't like.
Yes, publish new list. And do it regularly - edit and publish actual list, e.g. monthly, or quarterly.

Don't write only celebreties and famous sites. It's too easy.

New strict rules:
10 non-world-famous physical targets - persons/buildings/vehicles (and optional links for explanation)
10 non-world-famous informational targets - organisations/sites (and optional links for explanation)
10 group targets - i.e. "any ... of ..." (and optional links for explanation)
everything else