Generally this is true, but I think you are being dismissive by throwing this truism at his note taking attempt. The point of keeping a personal wiki, is tonote the things that has come to his attention and not to forget it and to come back to it later. Writing things down gives it a concrete form. Sometime I even force myself to write down things that I read and that is a reasonable cure for my binge reading procrastination. Even if you think it as just a glorified bookmark manager, it is more useful than your browser's bookmark manager . Many people who do not maintain a wiki may not realise that knowledge is incrementally gained and by having a wiki (or any place really) to note these things makes the process transparent and recallable.