It is not my local feed that concerns me, it is the fact that we will become part of theirs. It will be like when a post is popular enough to make it onto the front page of Reddit - suddenly a post that was crafted for a local community, with users that have a shared culture and background, becomes exposed to a random audience including trolls and bullies who take 2 seconds to judge it and have no barrier to putting on their own comment and starting a pile on.