I just realized something. When first using 8aweek, I noticed that it would track my restricted sites (say, Hacker News), but not the sites linked from my restricted sites (which, with sites like HN, are the real time-sucks). I remember asking about this, and the 8aweek guys said they were working on tracking those links, too. I'll bet dollars to doughnuts that's how they got started on Socialbrowse.