Google has for years been actively

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Many Black Hat SEOs argued that Google would never discover a truly private blog network.

However, many of them are easy to spot by experienced SEOs and therefore also by Google, even though they may appear natural at first glance to an everyday web user.

Using PBNs to build links results in unnatural links, and seeking to shut down such networks, with high-profile instances dating back to 2014 .

Google is finally able to discover virtually any PBN, and russia mobile database the penalties imposed can often be severe.

As Nathan Gotch comments on GotchSEO:

Not only did Gotch SEO get hooked on using PBNs, but several of my clients did as well. Before that happened, I thought I had complete “control” of my SEO because I had control of my backlinks. It’s crazy how wrong I was. But sometimes you need a tough time to change your ways.

PBN links can be difficult to discover and are often combined with other link spam signals, such as exact match anchor text links, due to the control the site owner has.