While at the NIF and possibly while working for Gutierrez, Rivlin used the screen names GrayRiv and ForumDriv at various social media sites to post propaganda supportive of massive and/or illegal immigration. His accounts included: twitter dot com/grayriv, digg.com/users/ForumDriv/history, and digg.com/users/GrayRiv/history. In all the posts I saw he didn't indicate his real name or who he worked for. I only discovered his name and affiliation after a 2/25/10 post at newsjunkiepost.com.
I've repeatedly asked Rivlin on Twitter (@douglasrivlin) if he ever disclosed who he worked for, and Rivlin has repeatedly ignored those requests.