Google is the center of search. There's nothing to push anywhere. Google can, and apparently is, wrapping social features around search. Google is laying the foundation, preparing the framework, for this to happen. Perhaps you noticed the dark strip running atop of the Google search page, which was new to me yesterday. That's in preparation for the + service, as is Google +1, which debuted at the end of March.
Search and + tied to Google search and Android phones give Google the potential to amass a social community extended to its other products and services: Apps (for creating and sharing documents); Chrome (for which new version releases every couple months); Gmail for messaging anywhere (rather than the confines of Facebook's website); Wallet for making purchases; Web Apps (for playing games and other fun stuff); among many others.