For me it all began last year with a message on the Yahoo! Developer Network del.icio.us mailing list. In the message, thefangmonster was introducing a a bookmarklet to make easier the saving of a particular tag when adding bookmarks on del.icious.
This particular tag is the “via:” one which is “intended to be a corollary to the for: tag, albeit an unofficial one”. It is in fact a totally unofficial tag, which nonetheless may help immensely in giving credit (whereand if credit is due) and keeping track of who your links are coming from.
How does it work?
- Anytime you save a bookmark, whether by posting or saving from another user, add one more tag, a “via:source” where “source” is the name or nick on delicious or the name of the website or author if he has no account
- When you want to see all the links you got from a particular source you can use it as a tag.
http://del.icio.us/nicoladagostino/via:rentzsch is an example of all the urls I got from well-known developer Jonathan ‘Wolf’ Rentzsch
- In some instances, if adopted by the users, it can even show additional info about the history of the link, as you can see I got it from my friend Nicola “koolinus” Losito and when later aqualung grabbed from me he added me as a source but also kept the original via: tag .
As you can see it’s a small addition that can be very useful if you’re a writer (like me) or researcher, if you are interested in the inherent “social” features of bookmarking or simply if you like to think credits (and thanks) should have their a place on del.icio.us
 who I’d like to thank for the epiphany
 although mentioned in summer 2005 in an offhand remark by del.icio.us founder Joshua Schachter.
 who also has a del.icio.us account.
 which after all should be expected since it looks like he got the original idea to use via: tags at the beginning of 2005