Del.icio.us and Tumblr is also acquired and killed by Yahoo. Also Geocities, like it's hard to serve some static files.
Del.icio.us was sold to AVOS systems. It changed hand a couple of more times and now owned by an entity called 'Delicious Media'. In its current state, it is almost non-functional. The bookmarklet for tagging links does not work, API and RSS feed are deprecated. I knew it was time to get out when I found the data export function to be broken. I wrote a scraper[1] to get my data out and export to some other service.
[1] https://gist.github.com/rubayeet/a5c25458986ddecafd5e569866c...
The demise of del.icio.us was expected the instant they sold out, but the good news is that the service was useful so it gave rise to shaarli[1].