Google is obviously the dominant search engine; but its position can be abused.
It seems to censor websites in all areas of the world, not just China. We all know Youtube is under heavy censorship now, but that seems to be extending to its search engine to better police the internet.
For instance, do a search for "Blogy Descarga Directa" on Yahoo and Google.
On Yahoo, you will find the website no problem. It also comes up when you search "blogy" or other simple key terms.
On Google, it's non-existent after it was removed about a week ago. Even a direct search for the web address yields nothing. Fair enough, this site links to series that shouldn't be downloaded but I don't think it's a search engines place to censor sites.
It seems I may well be using a few different search engines as well as Google from now on - just to make sure I'm getting a fuller set of results!