StumbleUpon. Faecbook, as well, but not so much. There's not as much to do on there. StumbleUpon is a potentially infinite time sink. In fact, I'd say Google R

StumbleUpon. Faecbook, as well, but not so much. There's not as much to do on there. StumbleUpon is a potentially infinite time sink. In fact, I'd say Google Reader has increased my productivity, since once I've skimmed the days articles from Slashdot/TechCrunch/etc, I crack on with some work, and I'm not as tempted to use SU.