16. The computer program product of claim 15 , wherein the program instructions to aggregate the usage indication data for the plurality of users of the electronic document on a segment by segment basis aggregate how much time the plurality of users spent viewing the electronic document on a segment by segment basis.
18. The computer program product of claim 16 , wherein the program instructions to aggregate the usage indication data for the plurality of users of the electronic document on a segment by segment basis determine an amount of time spent by an average reader on each segment of the plurality of segments of the electronic document.