What are the Best Times to Share on Social Media Sites?

I have always heard that there are specific times to share our articles, books, eBooks, etc. on Facebook and Twitter.  However, I always put off trying to learn exactly what these times are.  I ran across an article on Mashable that talks about the best times to share on Twitter, Facebook and Tumblr.  Sharing at these specific times is said to guarantee more eyeballs on whatever we share.  Here is the article: The Best and Worst Times to Share on Facebook, Twitter.  Check it out and please comment if you notice some success with this.