Haven't posted publicly at least.

This is exactly right and the title should really say that.

Yep, it would be nice to know how many posted at all. I guess it's not publicly available data ;-)

Of the "48%" (since there are some questions about the number), I wonder how many are cross posting to Facebook.

did you want the contacts from your twitter feed? or just to feed your posts from twitter to g+.

If its just the contacts you wanted you can go here: https://plus.google.com/u/0/settings/connectedaccounts?tab=X... and connect your twitter account. (I am pretty sure this will drive the 'suggested people' page on google+)

I also found this comparison of cross-posting tools:

http://techplugged.com/2011/07/29/link-and-post-google-plus-...

My posts.

More Than Two-Thirds of Google+ Activity Is Private: http://allthingsd.com/20110721/more-than-two-thirds-of-googl...

It's designed mainly for private sharing hence the circles.

If that's the case then 52% public posts is a lot, right?