As for the numbers quoted relating to Text and MMS to screen, I also must concur. I've personally seen in-venue participation rates top 20% with no other value other than "user-generated public commentary" (ie "text" or "pix"-to-screen). Adding additional incentives, such as sweepstakes and other promotional overlays, usually result in participation lifts in the single digits, but do much to ignite the depth of interaction (often reported as "messages per user").