http://vitrue.com/blog/2009/09/08/vi...t-on-tuesdays/
In partnership with MediaPost, we are excited to release new data insights from the Vitrue Social Relationship Manager, an application suite that allows brands to more easily manage, schedule, publish and measure messaging across Facebook and Twitter.
Vitrue SRM - Social CTR by Day of the Week
The new data illustrates the effectiveness of Facebook wall posts (in terms of click through) by day of the week. Presented in this chart you will see which days have the highest click through rates. Tuesdays and Wednesdays rank the highest.
As a mainstream marketer, I'm not surprised. I get the most clicks from organic SEO traffic on Tuesdays and Wednesdays as well.