The next GH statistic, directly under "Posts:", "GH+1" - The total amount of agreement or kudos to a user's posts.
The +1's and button for each individual post could be in the "« Reply #8 on: Mon, 06 May 2013, 14:51:57 +42 » [+1 button]" area as such without being obnoxious or making posts take up more space.