There is one more thing I've noticed. Where is h1?!?!?!
The logo should be clickabe h1 tag (with image-replacement).
Generally your header outline is poor. You use only h2, and h3 for 'reply-title' (!).
You should use h1 for logo, h2 for article's header, and h3/h4 for subheaders. Currently for article's subheaders you use strong and p tags (like 'Running shoes' in first article).
Proper header outline is good for SEO.