Looks like Zuckerberg and co. aren't waiting to become profitable before embarking on legal excursions. Do they not understand that services like this one can only help them in the long term by doing work for Facebook to satisfy users, thus keeping more people on the social network?
That is, if their business model depends entirely on ads. I think that the net gain of allowing services to complement their web app will more than make up for the loss of a small portion of ad views by making their application as a whole more compelling. By deliberately and aggressively excluding themselves from these services, Facebook only stands to lose users.
