One nice property of the Wikidata database is that it is a "secondary database. Wikidata will record not just statements, but their sources, thus reflecting the diversity of knowledge available and supporting the notion of verifiability." [1]

I think that's far better than voting. Voting for facts amounts to relying on a logical fallacy: appeal to the majority. [2] (Voting is fine for popularity contests, or things that can only be matters of opinion, but facts?)

[1] http://www.wikidata.org/wiki/Wikidata:Introduction

[2] https://en.wikipedia.org/wiki/Argumentum_ad_populum