In theory "Cool URLs don't change". But that's never quite true.
- I try to save excerpts when I link-blog. I do this mainly to save re-reading time, and to crossref WikiWord-s, but I also do it so I can re-find a moved document years later.
- a 5-word Lexical Signature generated based on Tf Idf should be sufficient. (Like a Google Whack.)
- having your own Domain is a good risk-reducer
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