I've only used mobile so far and think it could be cleaned up a bit. Everything is spaced out so much I spend more time scrolling that reading. (Not talking ads either, those are good)
For example the box with watch thread and the page numbers is huge with a lot of dead space.
Also not sure how to shrink up some spacing on the posts themselves but a lot of real estate taken up by non content, could be collapsed a bit. For instance the bar with all the like items, not sure we need that in mobile. Maybe a like button that could display next to the user's name that expands to the different options.
Also a quicker way to get to 'new posts' on both the top and bottom.
All in all looks pretty good and slick, just a lot of real estate lost trying to make it look too clean and browser like.
Would like to see the first unread post button larger and in the right as. It's so small in mobile.
Again this is all mobile feedback, haven't been to the site on a pc yet.
Keep up the good work!