Why are links used in ranking when they all have the nofollow attribute?

Today's question comes from Ed in the Caribbean eds in a somewhat bad mood because he asks, how can linking remain a major part of a search algorithm when the majority of Internet users are unable to post a followed link on the World Wide Web, for example, Twitter, Facebook, Wikipedia are all no follow. It seems only a very small percentage of links count.

How not to hide text

We had one fun question at Pubcon where people sort of asked about what are the different ways to hide text and what should I and shouldn't I do? I want to show you a couple slides about how you should not do it.

Why do big brands rank so well?

Santos in New York asks, as far as big brands go, Why isit that they seem to do well, irregardless of relevant content or links when analyzing keyword placement and search engine result pages?