1. Search engines have evolved how they evaluate backlinks, focusing more on user behavior when clicking links rather than how sites optimized links.
2. If a user quickly leaves a page after clicking a link, it suggests the link was irrelevant. But if the user stays on the page, it suggests the link was relevant.
3. Search engines can track this user behavior through tools like browser plugins and Google Analytics to determine high-quality, relevant backlinks that should be given more weight in rankings.