It seems like the strategy (especially given the revised privacy policy) is to converge every other service so that you're using G+ no matter what. Google Cont

It seems like the strategy (especially given the revised privacy policy) is to converge every other service so that you're using G+ no matter what. Google Contacts is now focused on circles, circles show up in Gmail, and you can control Google Voice activity based on circles. And I imagine this is just the start. I wonder if getting people to publicly post is really even on the critical path for them at all. If they change their services to be circle-centric and get enough people just to put people in circles, that gives them a ton of social graph data to mine even without posts.