In the recent past a survey was held among GNOME users, the results are available - Gnome 3.0 General Sociological Research.

Some of the details are interesting, this information can be helpful. I am particularly proud of the fact that most Gnomers are educated people with a university degree and that most of them want to continue their studies.

Perhaps this means that the survey is biased towards this group of people; it could also mean that Gnome is mostly used by this social group (which is a quite small part of the global population). Either way, take a look at the results and try to apply them in your activities.