<http://schema.org/logo>
<http://cdn3.tnwcdn.com/plus/img/tnw-brandmark.svg>
<http://thenextweb.com/socialmedia/2013/09/07/a-scientific-guide-to-posting-tweets-facebook-posts-emails-and-blog-posts-at-the-best-time/?goback=.gmr_66275>