I think more than 50 or around 50.I am using this account for my close friends that so why only about 50.
I currently have 12 circles with different categories. Minimum of 1, current max 47. But overall total? 104.
I have about 50 circles, but only a couple a friends. I really like Google+ as i think it is a mix of twitter and facebook. I wish more people would use it that i know.
I have 200+ friends in my Google + account. I randomly use the site and very cautiously choose my friend.
My friends laugh at me for checking my Google+ profile. So to answer your question, 0 active friends.
I have 250-300 friends at my Google + account. I enjoy using Google+ and enjoy sharing things with my friends. I guess the number of my friends will increase soon.
wow... Keep it up! hmmm let's see... I have around 841 in my circle... still finding ways to increase it...