Slashdot's system came close, but it only did half of what's necessary. IIRC there were no options where the +number and label disagreed -- they didn't have "+

Slashdot's system came close, but it only did half of what's necessary. IIRC there were no options where the +number and label disagreed -- they didn't have "+1 Spammy" or "-1 Insightful".