Watching the web

Performing my studies, I have to work on an article about Mobile Social Networks. I even started for social bookmarking at furl.net although I nearly never used bookmarks.
What for should I use bookmarks? I use more than three different PCs and Operating Systems. Even if I used the same browser everywhere, it would be hard to keep the bookmarks up-to-date ( I know, I tried using POP3). Let's see if social bookmarking helps or even lets productivity grow.