"If you are limited to the amount of time you can spend on Google+, I recommend that you focus your efforts on the following:
- Authorship – by following these steps, you can add an image next to your search listings.
- Videos – by sharing videos related to your business, you can roughly get 28.6% more engagement.
- Ask questions – you will get more comments if you ask engaging questions. These questions could be related to your business, the industry your are in or anything else that your friends might like.
- Post on Friday – there are a lot of people on Google+ on Fridays from 11 am to 2 pm"
Via Antonino Militello