Final answer:
Without specific usage data for the communication device, it's impossible to answer how many people in a world of 100 would use it. Surveys and statistical reports are needed to make informed estimations.
Step-by-step explanation:
The question "In a world of 100 people, how many would be users of this communication device?" does not provide sufficient information to determine a clear answer. To answer this question accurately, specific data regarding the usage of the communication device is required. This data could be obtained from a statistical report or survey research, similar to the various surveys and statistical information provided in the reference points. For example, reference to a survey on mobile phone users could give insights into the percentage of users engaging in certain activities such as messaging or calls, and this can be extrapolated to the scenario of the communication device in question if relevant and comparable.