Agreed on the random. Simply did sudo random for now. Didn't have enough time to make a full system to handle it.
The choice for the toggle was so that you could never see both the poster and the person at the same time. Maybe that's a wrong choice, but its what we chose to do for design.
Also agree on the fact that its hard for the user to know what to do with the buttons or if right/left swipe is what.