Self-employed researcher/writer; so plenty of freedom and spare time to go on PPRuNe, study, fly, whatever.
The people I know through PPRuNe are all in IT, or computer literate at the very least. Other pilots I meet, PPLs or professionals, frequently don't even have computers, and many haven't even heard of PPRuNe!!!
Conclusion - people who have computer access and are into aviation read PPRuNe; those who work in IT have access more often and read it and post more often. I really wouldn't deduce any more into it than that.
------------------
Whirly
To fly is human, to hover, divine.