Toppling Facebook becomes more challenging as that site continues to keep pace -- adding new features along with users. Friend circles, a distinctive feature of Google+ at launch, were added to Facebook in the following months, removing a major incentive to switch. What's more, Facebook's launch of the "Subscribe" feature -- which lets you follow public updates from a user -- further erodes the advantages of using a service like Google+ or Twitter.
Google didn't promote Google+ as a "Facebook killer," however. Far from it. The search giant instead explained that it was building a "social layer" to bind its services together. That promise is now being delivered upon: A Google+ activity bar now runs across the top of Google Docs, Google Search, Gmail and virtually every other Google service.
Via The New Company, Resonance