If you write a link in the comments starting with www (for example,
www.ya.ru ), and not with http: //, then it is converted to
xxx.habrahabr.ru / blog / www.ya.ru.For example, Maxim Rossomakhin today also
wrote a link to the www in the response to one person.
So you can make some sort of mod_rewriter for such a link? He will have to redirect people not to the page with error 404, but to the necessary site. This will allow not to shovel all such links already written, and you can collect statistics on how many people go to other sites.
Thank.