After reading Panique's well-intentioned idea on Signalizing/tagging INSECURE answers (and questions), I started wondering if there wasn't a better, simpler way to address this problem.
We've all seen calls for tag clean-ups and link clean-ups here on Meta. This normally works out pretty well, since everyone here on Meta knows how tagging and linking work on Stack Exchange sites. I also once made a post asking for ideas and help cleaning up the quality of a particular tag, which was at least moderately successful.
What I'm thinking now is a bit different, so I want to hear what the community has to say about the following ideas.
What would be the best place to post a "call to action" for this sort of clean-up effort? (Meta? The main PHP chat? A chat created for this specific cleanup effort?)
What should that call to action be? (Change code? Downvote? Leave a comment? Add a new answer?)
Note: I do have serious reservations about changing code in other people's answers, but I think the benefits outweigh the costs in certain situations. In the example link I gave above, I think a clear improvement can be made to a lot of answers without changing the intent of the code at all.