Also, from the "help" page: > When Yahoo sold del.icio.us to AVOS in 2010, there was a stipulation that users had to opt-in to have their data transferred. So

Also, from the "help" page: > When Yahoo sold del.icio.us to AVOS in 2010, there was a stipulation that users had to opt-in to have their data transferred. So if you have a really old (pre-2010) del.icio.us account, and you did not consent to this transfer at the time, then I do not have your data. It is sitting in a KGB datacenter somewhere, or wherever Yahoo! databases ended up. That's a bummer. I think I created my account in 2005 or thereabouts, and I don't remember ever hearing about this opt-in, so I guess my data is well and truly gone. Still, props to Maciej for recovering as much as possible.