This really resonates. I've been integrating Open Graph actions into everything I've built recently because it makes everything more "engaging". I would gladly pay to promote actions my users are taking to their friends, as would many other developers. It seems like the right direction, away from a broadcast model from brands and towards more natural ads.
We've implemented Open Graph as well for some brands - It appears as a user action on a brand, instead of the brand directly reaching out. That's an implicit recommendation from a friend - Much more powerful than a branch explicitly recommending themselves.