We currently have a Global Interactive Broadcasting Platform (iOS and Android) with source to destination delay of between 50ms to 1 seconds based on the geographic location and network quality (wifi - 4g 3g). This is Interactive Broadcasting meaning you can select anyone from anywhere and pull them onto your broadcast while everyone can watch .. (stop the Interviewee from Paris, select one from Rio then one from Delhi ....) while 10's of 1000's of viewers watch and interact.....
We have seen "traditional" streaming services like Ustream, Take It Live, facebook, YouTube etc with btween 10 sec to 60 seconds delay (sometime as much as 2 minutes). This is possibly OK for streaming but not for INTERACTIVE....