Link Spam Update.

Link spam updates are algorithm updates from Google specifically targeting manipulative link acquisition practices that violate Google's link spam policies. Major link spam updates were rolled out in 2021 and 2022, with Google stating they used SpamBrain — an AI-based spam detection system — to identify and neutralise links that were bought, sold, or artificially manufactured. Sites that relied heavily on link schemes often saw significant ranking drops following these updates.

What Constitutes Link Spam

Google's link spam policies prohibit: buying or selling links that pass PageRank; exchanging links for goods, services, or money; large-scale guest posting campaigns with keyword-rich anchor text; sitewide links in themes or plugins; press release and article marketing with optimised anchor text; low-quality directory submissions; private blog networks (PBNs); and link insertion schemes. The common thread is manufacturing or purchasing links rather than earning them editorially.

Protecting Your Site from Link Spam Updates

The best protection is a link profile built entirely on earned editorial links — the type of links Google is trying to reward. For sites that have historically used grey-hat techniques, conducting a regular backlink audit (Ahrefs, Semrush) and disavowing demonstrably toxic links in Google Search Console reduces exposure. Sudden drops in rankings following a confirmed link spam update may warrant an audit of recent link building activity and outreach to remove or disavow suspect links.