I am more and more fed up with stock images and turning to alternative sources of photographs for my presentations. Here is a great example of a real image with real people. If you want to make the point that the mobile era has arrived, you can do that with mobile penetration statistics (6b out of 7b people now have a cell phone), or you can just this great image by Josh Liba on Flickr, showing people consumed in their mobile world and not really interacting anymore among each other.