In my years of experience online i've come to understand that the actions your take on and off-page concerning your website has an effect on what Google determines for your website in their index. They determine the factors for ranking and each factor will have an effect on your site. I've had my fair share of websites where they've mysteriously stopped ranking, become deindexed or penalized. The question is not if a certain type of backlink or on-page content has an effect on your site. But rather, if it is a factor, what kind of effect will happen. I've often voiced my opinion about backlinks against the bandwagon. My experience has taught me that the theory which states "you can get a link from a bad neighborhood and it will not have a negative effect" is false. There are factors I have judged to affect how deeply a website can be hurt by bad backlinks but that's another thread. So in this thread we will take for granted and accept that bad links will do damage to vulnerable websites. Why are you going to war? I've been scammed for a few hundred quid from a website and I have no power to shutdown, however I do have my online marketing/SEO skills and will try to damage their site in Google. So here are some good tactics to take out "that guy you hate who fucked you over" On-Page content is the easiest route to getting a site deindexed. 1. If the user has a forum, find a list of very malware/virus heavy content and become a very active member of the targets forum. Begin finishing every post with a smiley like this . Wrap the smiley in your <a href> tags and your virus website. Do this for every post, ping using pingomatic and submit Google Spam Reports. Resources; Code: Use www.siteadvisor.com/sites/goggle.com to help select good dangerous backlinks to drop into their forum. Alternatively, if there are other vulnerable forms of input on to the site exploit them to the full. 2. Send a very professional letter to their host explaining a copyright issue or some other reason to get the hosting for the target suspended. 3. Use "security testing" software like "metasploit" to to look for server/website vulnerabilities and exploit them. This can be a little advanced. Look for signs of plugins, software types on their site and then look for the appropriate exploit, load it and fire away. (eg, vbulletin version, apache version) Resources; Code: www.hackforums.net www.milw0rm.com 4. Use bad SEO software to build nasty links There is a lot of software out there that can do damage to a young website, sometimes irreparable damage as i've found out in the past. Message board blaster pro This piece of software has never failed to destroy some of my own websites. The only bad point is that i don't think you can dump anchor text into the posts. But you can fill the post with negative words like suicide, snuff or whatever. The software posts to around 1,000 boards in which every single post of the website has viagra or some other sort of spam/dangerous links. Apparently, every forum board had been created by the software seller, so this is a great tool for hurt the rep of another site. It successfully destroyed one of my sites completely and it has never managed to come back from page 200+. Resource; http://www.blackhatworld.com/blackhat-seo/black-hat-seo-tools/2089-message-board-blaster-pro.html Ping Scripts There are a few pings scripts out there which are very dangerous. I had a very strong website which has been in and out of penalty ever since i used a dangerous script on it. The script used some websites which had a lot of viruses on. I can't find the post right now but it is a php script you upload to your hosting then run on your site. It would post to around 1,000 websites. It seemed good at first but people began complaining of virus alerts and then I noticed a huge drop in rankings on the target sites. PR Storm Use PRstorm to spam referrer the bejeezus out of target site onto matt cutts blog or google itself. Be extremely spammy. Possibly make them ban the proxy which you should use. Spam everything, everywhere. Google does take notice of this kind of activity. That's why they tell you not to do it. It's late, i'll contribute to this post more in the coming Days. If anyone would like to test the theory that off-page can impact your site feel free to give me a site i'll see if i can do damage. This will be a running thread and i will update periodically. Please contribute good software or tools which can destroy a site in Google index.