We discovered that speed and subtlety matter a lot to bloggers and media websites. We incorporated that feedback into our design and tech. Compared to Genius, FundaMine's design is really subtle and fits into the website's design. We also don't use iframes for the annotations. This makes FundaMine light-weight and blazingly fast even on mobile connections where most consumption happens.
Totally agree with rodina. Comments are the best way of validation for an author. And inline comments help in getting more comments because of better context involved.