Rushes email issues
The periodic "Rushes" email is long enough that gmail clips it and you have to open it in its own tab to see the whole thing. I suspect a significant portion of your users are on gmail so it wouldn't hurt to keep the email within their limits.
Also, the rushes email shows "recent" reviews from my friends. But my friends seldom write reviews so it shows me the same three reviews from my same three friends every single week. I'd prefer you just say "your friends haven't posted any reviews lately" than have to see those again.