Actually, I want to know that can competitor hurt my website ranking. I am seeing, somebody is doing negative activities for my website. Before three days ago I have checked my google webmaster account. I have seen that, there are more than thousand 404 pages in the account, and then I have checked that, from where am I getting these links (404 links)? There were lots of classifieds sites, where somebody posted my website link wrongly (put broken link). I had got this site emoment.net, which has 5018 links to my website and total links 17028, i have in google webmaster account. I am still safe; I have not got any negative effect till now. But i am confused, Will I take it seriously or ignore?