Google removed a useful feature from their best service (according to me) Google Reader: sharing links. They did this in order to shove Google+ down our throats. That's not going well.
So Google Reader users found all sorts of replacements for the feature. Too bad Delicious didn't take advantage of this opportunity to promote their service to Google Reader refugees and maybe create an easy migration tool. Delicious is, as far as I know, the best replacement for it and the best way to share links.