I took a couple of screenshots of chat on the Nexus. As mentioned, the dimensions of the screen are different than an iPad (the Nexus is more of a widescreen when used in the portrait view). The on-screen keyboard makes chat almost impossible. The pop-up chat box is outlined in red--this is where I enter my reposnes. The questions from the user and our convertations would be above it and aren't visible.
The chat window is visible is you use the Nexus in portrait mode (see below), but the keyboard is difficult to use. If we wanted to use these for chat on a regular basis, two things would need to change: 1) Better wireless, and 2) we'd need external keyboards.