[anf]

I don't think likes are meaningless — they tap into a very primal need for social status and peer approval. It's a stupid game, but like many other stupid games, it's effective!

[wolco]

They miss out on the social status a dislike can give. To be against something is easier for many then to be for something.

[bredren]

I grant you that, it is effective at getting page views and ad revenue.