Since Search plus your world was announced, Google+ has experienced a sudden surge in activity. Shame most of it is online marketers posting links to their stuff and to establish ‘context’ or to build a network. At least Google can now quote some more impressive figures regarding actual usage within the network now.
It is not surprising that announcing a certain Google product could be used to get more content into Google’s search results would result in this kind of behaviour. The question is how many of these newcomers will use Google+ as a social network as well.