What the ephemerality of the Web means for your hyperlinks
The substantial linkrot and content drift we found here reflect the inherent difficulties of long-term linking to pieces of a volatile Web. The Times in particular is a well-resourced standard-bearer for digital journalism, with a robust institutional archiving structure. Their interest in facing the challenge of linkrot indicates that it has yet to be understood or comprehensively addressed across the field.
Source: www.cjr.org