Why does everyone random vote at the start of a game?

[Yosarian2]

An inital random vote, or an initial choice to not random vote (I random vote about half the time) can give information, and so can when a person chooses to remove their initial random vote.

Lately, I've sometimes been semi-random voting in my second or third post of the game, instead of my first post, because I seem to get more interesting reactions that way.