NETROT and WEBROT

netrot
Date: 1994
The property of information in which the quality of references to network addresses (email accounts, host names, etc.) deteriorates in accuracy over time. Entropy, as applied to Information exchanged on the Internet.
webrot
Date: 1994
The property of netrot applied to web pages and other hypertext documents exchanged over the World Wide Web. E.g. when you run into non-transient "404 Error, Link Not Found" errors when surfing the web. (1994)
An example of webrot:
You spend lots of time doing web searches to find any related information about a topic you are looking for, and find a number of promising hits from your initial search. When you go to visit those pages, you then find that they either don't exist, point to the wrong information, or contain hypertext information with many links that no longer work. These pages have been afflicted with webrot.