Can competitors destroy your site rankings?

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In SEO is natural and balanced art this post mentions that if your site external links suddenly increase massively, there may be harm to your site rankings.

Some readers put forward reservations that the external links will not lower the rankings, otherwise it is too easy to deal with competitors.

Of course, his argument is very reasonable, if only by making a lot of junk links to competitors can reduce the competitor's website rankings, it is too unfair.

This has not happened so far, but is there any chance that competitors will ruin your site's ranking? I have always thought it possible, though very difficult.

Please take a look at Google Webmaster information, the fact and the fallacy part of a question and answer,

Fallacy:
Competitors have the means to destroy the site's rankings or remove other sites from Google's index.

Fact：
Competitors have little way to do anything to hurt your ranking, and it's impossible to remove your site from our index. Your webmaster can control all the factors that determine whether you are listed in our index and the ranking of the site, such as Content selection and website design.

The emphasis in the first sentence, "There is hardly any way for competitors", speaks of almost, rather than utterly, no way.

As you can see from the information disclosed by Matt Cutts and other Google employees, they have never said that competitors are completely incapable of harming other sites, always saying that there is almost no way.

Let's imagine that competitors are likely to do things that hurt other sites, such as the manufacturing of a lot of spam links mentioned earlier. If the spam links are strong enough, it may make your site's theme deviate.

For example, your website content is ringtone, but your competitor brings you a large number of Chinese herbal links to the text of the spam link. In the best case, search engines will ignore these spam links, so it won't have any effect on your site's ranking under the keyword of ringtones. But if a competitor hides itself well, and the spam links come from strong enough sites, it could make your site's theme deviate from the keyword of the ringtone, thereby lowering the rankings.

Competitors, for example, can massively copy the content of your site, making it possible for your Web page to be considered a replicated content page.

But both of these situations have a prerequisite, that is, your own site is weaker. If your site is strong enough, these external factors are hard to work with.

It's not impossible, but the time and effort that a competitor takes to hurt your site isn't worth it at all, and it's better to take the time to strengthen their own web site.

So I think competitors are likely to hurt your site rankings, and have happened. But for most stationmaster, do not need to worry at all, the best way is to make your website strong.