commit: b67d552 - hire banner add for jobs on other sites (2014-04-23 08:56:43 -0400)
Greg, Negative SEO is real, but requires a lot of time and commitment.
Yes, but there are services who hire cheap labor to do it for you. You could get thousands of backlinks for $100-$200 if you search for it. But as I said I don't think it's very effective when done against a quality site.