US, Japan, and Switzerland seem less socialist than Scandinavia, Austria, and France by standard measures, right?
Questionnaire is a proxy measure, but it's better proxy than some random blog rant.
Here are some obvious things that might reasonably correlate with trust, but don't seem to:
A monthly thread for posting any interesting rationality-related quotes you've seen recently on the Internet, or had stored in your quotesfile for ages.