Use SEnuke or BMD to make social bookmarking automated(well, semi-automatic mostly).
If you're gonna make it yourself you can't bring in 2000 visitors/day, because it would take longer than 24 hours and your mind would blow up in front of a pc
SEnuke is a good tool, I think better than BMD, because BMD latest version 5 is very buggy. Or use OnlyWire, I've heard good reviews of it!
Another option is to make your own macros, if you know programming or use Ubot to make a Social Bookmarking Bot yourself without programming skills. You have a lot of options and work too!
Happy Bookmarking!