A new study from Forrester Research has found a decline in the number of content creators across social networking sites, even while general use and participation on these sites has risen. The group of users classified as "Creators" - those who record videos, post blog entries, write reviews and post comments to articles online - are less active this year than they were in 2009, with shrinking percentages of users in the majority of markets studied. In the U.S., for example ,the Creators category dropped from 24% to 23%.