3 Customers with more than 1000 users in production deployments needed for Gartner social software market assessment

I am working on submitting the Drupal survey response for Gartner's latest research report. We are looking for three customers with 1000 users in a production deployment. Ideally these would be successful deployments and the customer would be willing to have a quick chat with myself to ensure we are providing the right customer reference. Good customer references are the single biggest factor in impacting report recommendations.

From the Gartner Social software market survey

We got interviews from:
Justin C. Klein Keane University of Pennsylvania School of Arts and Sciences which is standardizing their department on Drupal as the default CMS courtesy Alex Urevick-Ackelsberg.
BestBuy's BlueShirtNation intranet which has 25 000 users. Steve Bendt responded to my public post in the marketing group.
Tracy Frauzel from Greenpeace UK courtesy Robert Castello
Jupiter Media's Ivan Raszl for Adsoftheworld.com site, courtesy Khalid
SonyBMG Suzi Arnold courtesy Earl and recommended by Angie.
Morris Digital's Steve Yelvington regarding 20 sites and the largest with more than 175 000 users

"You must be able to name at least 3 customers with more than 1000 users (seats) in production deployments. You may optionally include two additional reference customers. If you meet the criteria for inclusion then some of your customer references will be contacted via email or phone. Otherwise we will let you know that we will not be contacting your references. Key points we will be looking for is large scale usage of the products and degree of success."