But Facebook had a rather ingenious strategy for their slow rollout. They rolled out an entire college at the same time, so once Facebook was available for you,

But Facebook had a rather ingenious strategy for their slow rollout. They rolled out an entire college at the same time, so once Facebook was available for you, it was also available to a significant part of your friend group (the lifeblood of a social network). Google+ however just released slowly to a random set of people, so some people could get on, but none of their friends were there.