The Cosmopolitan Blog

Which site(s) do you consider the most popular web 2.0 / social bookmarking sites out there? Vote now in the poll on the right (scroll down a bit if this is the latest post of this blog). Also, i want to hear from you. Which sites to you like? Which work well? Which don’t? What features do you like? Which are the easiest to use? Which ones do you use for self-promotion, and which ones do you use for a collection of interesting links? Am i missing some crucial sites in my list (see poll)?

Write your comments below after you voted (in the poll, you can pick as many answers as you like).