Actually, I am wondering if many google users have "adopted" Google+. It seems to be quite interesting.
Personally, I use Google often for reasearch, etc., but it is, as far as I know, the conventional system, and I am fine with it, and, in case of need, there are some other systems, which can help in special cases.
But I am old-fashioned and I am already dealing with too many sites, messages and mails, and I don't have so much time.