I've also read at another forum about a thread of a person doing negative SEO to eliminate competitors' websites that are 5 or 6 years old. And he's bragging it to everyone. I know it's a "kill or be killed" world out there but must we really turn the guns on each other?
Furthermore, with all the Google updates like Panda, Penguin and hummingbird, with everything focused on quality, negative SEO can really have an impact on your site if you're unlucky enough to be targeted.
I'm not really an expert on SEO but as for as I know the odds are really not in our favor. And we can't do anything once a site gets targeted. What's your take on this?