Spotting trend setters on the web is going to be a little tough because of how large and segregated it is. Some datasets people use is Wiki based around commen

Spotting trend setters on the web is going to be a little tough because of how large and segregated it is. Some datasets people use is Wiki based around comments / edits or who created a page first which became popular in the end. You could also use Facebook likes (facebook.com/me/likes) where each hlike is time stamped.