QUOTE(raveenasen @ Jun 19 2013, 11:58 AM)
Reverse seo is a technique of decreasing a competitorís rank in the Google Search Engine. it can be done by a jealous competitors, angry clients, any enemy, etc by posting negative threads, bad reviews etc.
Could you please elaborate on how to do negative SEO? I don't think that it may be possible. You can certain write negative review of your competatior but I don't think that it may effect on ranking.