82 Million User-Generated Content Creators and Counting
http://mashable.com/2009/02/19/user-generated-content-growth/
Can User-Generated Content Change Your World? - eMarketer
http://www.emarketer.com/Article.aspx?id=1006888

Dobrý úvod

eMarketer 2008年的报告，关于生产性用户、生产的内容等的调研与预测

This article hypothesis about the long term impacts of user generated web content on greater society, and the many professional facets within society (albeit within an American context). Stills discusses how user generated content can only increase in size and rapidity, as new media platforms continue to increase in size and rapidity. He also discusses how platforms such as the internet have allowed for a liberation of free speech and communication amongst individuals, whereas 10 years ago there were limited avenues to get your opinion heard. This article provides an interesting insight into the phenomenon of user generated content and how pervasive it has actually become.

Every day, user-generated content (UGC) is part of the online experience of millions of US Internet users. From entertainment to communications to e-commerce, consumers are taking charge of the creation, distribution and consumption of digital content. And it’s growing. Up from 83 million in 2008, eMarketer estimates the number of UGC creators will grow to 115 million in 2013.

Info on growth of UGC and creators, consumers of UGC

Statistics and predictions