This is the core concept of organizing the world's information. If you think otherwise, you don't realize that the majority of the world's information is held by individuals for brief periods of time and specific to its application. The generalized consensus has already been archived, but insights into emergent things that come up in life have not. Connecting people with each other to give advice about situations that can't be predicted but can be categorized is the next step.
Maybe the strategy is to eventually make sessions public? which would actually add value for the community.
Or it's a cheap ploy to get people to use Google+ (and if so, good luck with that).