For me it was del.icio.us which used to be free but became supplanted by a paid service once acquired by Pinboard. I know there's the "synced bookmarks" featur

For me it was del.icio.us which used to be free but became supplanted by a paid service once acquired by Pinboard. I know there's the "synced bookmarks" feature of various browsers but: a) I don't want to be trapped to one browser because the same browser isn't necessarily the best experience on different devices b) del.icio.us had superior capabilities for tagging and finding links