Yeah. Back in the day, Facebook's reaction to very successful groups like Un millón de voces contra las FARC and One Million Strong for Obama) was a great example of this: they reworked group functionality to make it a much less effective organizing platform. Similarly tThe Get FISA Right organizing on my.barackobama.com (using the platform to challenge Obama's postiion) was so threatening that it was part of the reason they shut the whole platform down after he was elected.