Before the first ever Twitter, Foursquare and Facebook, there was social bookmarking.
SEOs loved social bookmarking websites. They were easy to use, passed along some authority and generated huge amounts of traffic. Then, slowly, the social bookmarking sites started to implement the dreaded nofollow tags. These neutered social bookmarking sites, meaning they didn’t pass on anything that . . . → Read More: Is Social Networking Still Useful to SEOs?