"Arguably we still do not have a satisfactory realization of the memex."
Yup.
A related issue: Ted Nelson's original idea for hyperlinks had them working both ways. When one document linked to a second document, the second document would automatically get a link back to the first. His idea also had what he called "transclusion" -- sort of like block-quoting someone else's text, but with the feature that when the quoted text was updated, any document which had transcluded it would also automatically get updated.
Of course, there are some practical issues there, not the least of which is (as several others have mentioned) vulnerability to spam.
Yup.
A related issue: Ted Nelson's original idea for hyperlinks had them working both ways. When one document linked to a second document, the second document would automatically get a link back to the first. His idea also had what he called "transclusion" -- sort of like block-quoting someone else's text, but with the feature that when the quoted text was updated, any document which had transcluded it would also automatically get updated.
Of course, there are some practical issues there, not the least of which is (as several others have mentioned) vulnerability to spam.