Here's a link to the article: http://techcrunch.com/2012/04/18/facebook-targets-may-17th-for-ipo-date/
Venture capital investors in Facebook include Accel Partners, Andreessen Horowitz, Elevation Partners, Founders Fund, Greylock Partners, Kleiner Perkins Caufield & Byers, Meritech Capital Partners, Millennium Technology Value Partners and Technology Crossover Ventures.
Here are links to prior posts on Facebook:
http://www.allenlatta.com/1/post/2012/04/the-rationale-behind-facebooks-acquisition-of-instagram.html
http://www.allenlatta.com/1/post/2012/03/facebooks-updated-ipo-registration-statement.html
http://www.allenlatta.com/1/post/2012/2/facebook-files-for-ipo.html