There's loads of threads about negative SEO recently. I can't say i am a big fan as i don't think it is a professional approach. Having said that i would like to do my own tests to see how much authority a site must have before it is immune to most negative seo attacks and wondered what the legality of negative seo was. I don't own Xrumer myself so i would need to buy gigs on Fiverr which is fairly easy and the people you buy them from don't know your intent (assuming you don't use absuive, irrelevant keywords) but i would like to know if it was illegal or not. I am thinking in terms of test purposes so there are no threat to my sites as i can do it in different niches. So is negative seo legal?