indecisive online voting

Most people expect that voting twice (once voting negatively and once voting positively) will do nothing to the overall fractions of the thumbs down and thumbs up, when in fact, it shrinks the fraction of the positive thumbs up over the total thumbs.

Really? That douchebag reduced your overall percentage of thumbs ups by indecisive online voting? (Ex. 75/100=.75
76/102=.74509.....)