Mysterious domains appear in virtually every website’s backlink data, with URLs pointing to WhatsApp contact named “Exlinko”—SEO industry grapples with data integrity crisis

The phenomenon, first noticed by SEO professionals using Ahrefs’ free backlink checker tool, has raised questions about the integrity of backlink data and the challenges facing search intelligence platforms in filtering spam at scale.

A Global Footprint with a Curious Signature

Website owners and SEO specialists worldwide have reported finding links from exlinko.net and seoflx.net in their backlink profiles, despite having no connection to these domains.

The backlinks appear indiscriminately across sites ranging from major corporations to small blogs, suggesting an automated spam campaign of unprecedented scope.

What makes this operation particularly unusual is that the URLs from both domains appear to redirect or point toward a WhatsApp profile, with multiple references to the name “Exlinko” throughout the link structure.

This suggests a coordinated effort to drive traffic toward a single contact point, possibly a freelancer attemping to sell backlink services.

Ahrefs Remains Silent

Ahrefs, one of the industry’s leading SEO intelligence platforms, has declined to comment on the issue or indicate whether it plans to remove the spam domains from its index.

This lack of response has frustrated many in the SEO community who rely on Ahrefs data for critical business decisions.

The Exlinko Mystery

The identity and motives behind “Exlinko” remain unknown. Industry observers speculate the operation could be:

• A black-hat SEO service attempting to demonstrate reach to potential clients
• A lead generation scheme designed to funnel curious investigators to a sales contact
• An attempt to manipulate backlink data for unknown competitive purposes
• A proof-of-concept demonstration of vulnerabilities in SEO tool indexing

The WhatsApp connection suggests the operators expected people to make contact, though what service or proposition they intended to offer remains unclear.

Several SEO professionals who attempted to reach the WhatsApp profile reported a person with very poor English communicaton skills offering a backlink service.

Industry Impact

The spam infiltration highlights a persistent challenge in the SEO industry: the vulnerability of backlink databases to manipulation.

While major search engines like Google have sophisticated algorithms to discount spam links, third-party SEO tools must constantly battle new techniques designed to pollute their indexes.

“This isn’t just an annoyance—it undermines trust in the data we’re paying for. When your backlink profile is flooded with spam, it becomes harder to identify legitimate issues or opportunities.” said one Ahrefs customer.

The incident also raises questions about the resources required to maintain clean data at scale. With billions of web pages and trillions of links to track, even well-funded platforms can struggle to filter sophisticated spam operations in real-time.

The fact that a single operator—presumably “Exlinko”—could infiltrate the backlink profiles of essentially every website in Ahrefs’ index suggests significant gaps in spam detection protocols.

What Website Owners Should Know

SEO experts emphasise that links from these spam deindexed (Google) domains are unlikely to harm a website’s actual search engine rankings. Google and other major search engines have long employed algorithms specifically designed to identify and ignore such spam.

A Broader Problem

This incident is far from the first time spam has infiltrated SEO tool databases, and it likely won’t be the last. The economics of spam—low cost to execute, potential for profit through black-hat SEO services—ensure that new techniques will continue to emerge.

What distinguishes the Exlinko/seoflx.net campaign is its apparent scale and the audacity of leaving a clear calling card in the form of a WhatsApp contact. Previous spam operations typically attempted to fly under the radar; this one seems almost designed to be noticed.

The question facing the industry is whether platforms like Ahrefs will invest in more aggressive filtering systems, or whether users will need to accept a certain level of noise in their backlink data as an unavoidable cost of comprehensive web indexing.

As of publication, both exlinko.net and seoflx.net remain live, and their links continue to appear in backlink profiles across the web. The domains’ operators have not been publicly identified, and the WhatsApp profile associated with “Exlinko” has provided no clarity on the operation’s purpose or scope.