If you have added toxic links to your site, deliberately or inadvertently, the consequences can be dire. Search engines may dock you numerous rankings across the board and could even have you removed entirely; this is the very definition of an SEO disaster.
So if you have these links coming into your site and it is suffering as a consequence, what can you do? Well, first of all, get rid of the link and any others that may be devaluing your linking strategy. Whilst a good number of links is key to improving the strength of a site, they have to be the right kind and can’t be ill-gotten.
A toxic link is essentially anything coming from a website that is considered disreputable; perhaps they are known to sell links (often known as a link farm), have a reputation for spreading malware or have been found to be spamming Google – none good news for you. Don’t pay for links from questionable sources and always keep an eye on who exactly is linking in at all times.
The recovery of search engine rankings can take time. Although after your pages have been re-indexed and the linking process evaluated again, you should begin to notice a few upward arrows. Essentially you’ll be starting again, although with the significant advantage of already having your content and other SEO work already intact.
Essentially, when you upset Google its best not to try and fight it. If there is something on your site that shouldn’t be there, whether or not it is there by your own hand or not, get rid of it. If you can’t immediately find the offending toxic link in your midst, then I’m afraid you’ll have to go through and remove any links that you can’t knowingly trust. This is the only sure-fire way to ensure that you get the offending article and make your peace with Google, Bing et al.
If you are suddenly plummeting down through the rankings, then you should try to contact Google directly. Their advisors will be able to let you know if there are any reasons, beyond simple algorithmic changes, that you should be aware of. This is often the only way that you can find out if the issue lies with toxic links or elsewhere in your optimisation attempts.
Fundamentally though the best advice is to not get involved with anything online that you don’t fully understand. If you’re paying money for links, make sure that it is from a legitimate source or don’t bother – you’ll just end up wasting your time and money. Don’t do anything that contravenes search engine rules – which basically means using your common sense.