Aug 14, 2013
the website guidelines about what articles are considered relevant for posting:
“News should be relevant to our members in the U.S. and Canada.
Topics should not be solely about gas or oil prices going up or down; they should have more substance.”
"Relevant topics include: energy, clean energy, petroleum (oil, gasoline, and other fuels), automobiles, transportation (primarily autos), and vehicle safety. Other stories may be posted, but are subject to removal."
I think "other stories may be posted" is why the moderators allow (and post) varied topics