The internet ist not citable
After 5 years are only about 10% of all sources for my articles with the same contence as in the time where I made the link.
I made 2003 links to the first test of the Intel Centrino. Not whatever tests, but links to big online magazines. What remained February 2008? Nothing! On the linked URLs had been not the old test reports, but links to new articles.
It's madness! It's like to erase the 1. world war from the history books and to replace it by a list of more actual wars.
But this is even harmless compared against expired domains, purchased only for advertising revenues. There was a link to a very good article, very usefull for the own readers. Some years later, there is only a long list of advertising links.
This is bad, because there is at Google the term "Linking to bad neighbourhood". This means a web site can be penalized at serach results for making links to bad web sites.
Sources for articles are often stored on my own computer. There, they remain also in 50 years like in the time where I wrote the article. But it's not possible to publish such copies, this would be against copyright.
So I have to say, the internet is not citable.