Google+ is my second biggest traffic generator to my hubs, but getting to this place has required quite a bit of work. I achieved this through the following:
1. Being an active member on Google+ - More so than the other social networks, Google+ really requires quite a bit of interaction. As an example, I have around 4,000 followers and follow about 4,000 others. I belong to around 10 communities (Google+ forums) for the subjects I am interested in (mainly small business), which gets me a large potential audience for my posts.
2. Don’t share ‘naked links’ on Google+ Just posting a link to a hub without an explanation isn’t going to work. You need to provide a context for what you are posting and why it might be useful to people. This matters even more in the community forums, as if you don’t add value, the moderators will class your link as spam and delete it.
3. You need to persevere. Google+ is about building up reputation and trust in what you write. That means replying to other’s posts, +1ing others and more. It’s not something you can just throw a quick link onto and hope it will work. Effectively hash-tagging your posts can help people find them as well.
4. You may want to analyse when your posts on Google+ do well. I use Circlecount which tells you when your posts are most shared, commented on and plussed.
I hope this helps – Google+ has a very vibrant community and following and with a bit of effort can be a good traffic generator for your hubs.