I've used Delicious for 12 years, with 10,000+ bookmarks in it. Delicious went up and down and was sold, I got nervous and got a Pinboard account as a backup, back when it was doing one-time charges, but inertia kept me in Delicious. The recent downtimes, plus the iOS app no longer working, and Pinboard extensions making saving links easy, pushed me over last month. I was frustrated that the Delicious export went away, so the Pinboard acquisition is going to be perfect for me.