A tale of two coffee machines - Weapon of Influence in action
blog.smartupz.com
blog.smartupz.com
And in this case it is also not hard to show that such behaviour is not a winning strategy, if you want to maximalize your chance to make the best choice. But still it seems to be a winning strategy, if you want to avoid making the worst one.
I think the catch here is that people tend to think that they in fact want to make best choices and not just avoid the worst ones.
Last weeks of Bull market on stock exchange is the best example of the situation where people follow Social Proof and at the same time they are making worst possible thing (buying overpriced stock).
Actually, you can even point out that a decision made by the majority can't be the worst one in a social sense and I don't think it's completely stupid - after all, if you're in a social group and don't know what to do, it's always good to make sure that you won't end up worse that the majority since it happens quite seldom that the majority ends up very bad.
Hypotheses: we are pack followers, we like to see our coffee is fresh.