I liked del.icio.us, it was online bookmark sharing, but with actual people I knew, and it had genuinely useful category tagging. I guess it was basically replaced with https://old.reddit.com and maybe twitter.
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I will bookmark the site to pay my utility bill, but it's not something I'd ever share. I might share a link to funny YouTube video, but wouldn't bookmark it.
I think social bookmarking didn't really know what it was, which is why the modern versions are more about sharing links than bookmarking. I don't post my bookmarks to Reddit, where people follow me as a person. I would post links I think are worth sharing to a topic people are interested in following.