The problem is when I suddenly remember something I saw a month ago that is now relevant and I can't find it anymore. That's why I preemptively bookmark interesting stuff
I was a big del.icio.us user back in the day, maybe self hosting something like the OP is the way to go.
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Isn't submitting a response enough to convince the rest of us plebs that you agree or have other strong feelings about the parent comment?
Chances are good that, unless you're James Joyce, folks will read through the entirety of your statement to draw inflection from what you've conveyed.
When you don't agree with the parent comment, have you kicked things off with, "Not this" or, more succinctly, "!This" before making your counterpoint?
For me, Google has a mind of its own and has not been reliable in giving out related links even when I search with the exact page title from memory. Happened a lot with stackoverflow type sites.
I use Firefox bookmarks and think it has a reasonably good bookmark manager with support for tags and custom keyword searches etc.
Tip: In Firefox you can search bookmarks directly by prefixing searches with a * . It can even search bookmark tags.
Sadly Edge doesn't do tags, I initiate them by appending keywords to the bookmark name.
(I have to use Edge at work.)