You could ignore it, just like you ignore dozens of other stories every day. You could flag it if you think it's inappropriate for Hacker News. You could write

You could ignore it, just like you ignore dozens of other stories every day. You could flag it if you think it's inappropriate for Hacker News. You could write a blog post about the problem you see and submit it. You could stop reading the offending sites. You could develop a CulverBlock browser extension and share it with like-minded people. Or you could complain.