This article speculates about the real reason Facebook made the change from Fan pages to Like pages. I make the case here that Facebook did this, because of the rapid increase in popularity of social bookmarking sites, and StumbleUpon in particular. [...]
This is a question I get a lot:
“There are so many bookmarking site and i am confuse which site are the most effective in bookmarking. i dont want to waste my time on those site with poor affiliation when it comes to SEO.”
Here is my answer: look at the page rank (PR) of the social bookmarking [...]