Inevitably, writes
Anderson, at the top of these four sites, "there is, or will be, a little black bar and a little red notification indicator." Put another way, Google's massive online footprint gives it "the power of
accretion," he explains.
"The constant reminder this black bar/red notification provides, means that Google+ doesn't need to have high engagement numbers from all its users in the beginning. Day by day, one key person after another will find that they enjoy the G+ platform more than its competitors. They'll start posting and then the ball starts rolling."