linkblocking

Linkblocking is a technical practice used by websites and online services to prevent access to their content through external links or referrals from certain websites, known as block-listed sites. This technique involves manipulating URL links to specifically exclude incoming traffic from blocked domains, thereby restricting or entirely blocking access to the linked content.

The purpose of linkblocking is primarily to manage traffic, control user experience, and reinforce branding by mitigating the influence or reputation-risk associated with a specific domain or website. It can be used by online platforms, such as news outlets, e-commerce sites, or social media, to redirect or bar access to such links. In some cases, linkblocking aids in strategic marketing and advertising, by selectively exposing their content to audiences that are more likely to engage positively with their brand.

Linkblocking can be implemented through a variety of methods, including manipulating HTTP headers, exploiting browser quirks, or leveraging content management system configuration. Some linkblocking methods also involve IP blocking or geolocation-based filtering, which may limit the types of devices, networks, or geographic regions that can access the blocked content.

However, the practice of link blocking is not without controversy. It eliminates user choice, bypassing a website's referral traffic and potentially limiting user experience and accessibility. Some users might also view it as a tactic used to exert undue online censorship, raising concerns about internet openness and flexibility.