From Pew Internet via TechCrunch
39% of online teens share their own artistic creations online, such as artwork, photos, stories, or videos
33% create or work on webpages or blogs for others, including those for groups they belong to, friends, or school assignments
28% have created their own online journal or blog, up from 19% in 2004.
27% maintain their own personal webpage
26% remix content they find online into their own creations