Biggest difference between Facebook and Google + for me is WHEN I joined each platform. I started using Facebook as a student, at a time when you needed to be a student (have faculty email address) to become a member. It was a drop-in replacement for a local alternative named The Student Bar (now dead).
The moment I graduated and joined the working world I needed a platform to network with professionals. I gravitated toward LinkedIn and Twitter. Now Google + has arrived at the perfect moment. I want to maintain connections with handfuls of friends from student days, early work, and the work I do now.
Circles is a killer feature, but actually, what sits at the core of what I like about Google + is that it has just launched and I have the opportunity to start from scratch. I can build my social circles with the benefit of hindsight, avoiding all the privacy pitfalls I stumbled into on Facebook. That’s a big +1
Cross posted from my Google + Profile