RTFA:
"Google’s Larry Page has announced that Google+ now has 90 million users globally, doubling the number from three months ago. Page also said that G+ has a 60% ‘daily engagement’ rate. This came as a part of Google’s Q4 and fiscal year 2011 financial reports."
The fact that they're starting to throw up weasel words tells me that the "60% daily engagement rate" figure might not be exactly what you think it means. I'd be much more interested if they'd tell us exactly how many people log in and at least view their timeline every day. I'm not interested in how many people hit personalized search every time they do a search because they happen to be logged in.
