its just like facebook ..share your links pics and videos with your friends.. In google plus there are many other features which fb does not have. just sign in with your gmail id and make unlimited friends and followers.
Google + is a social networking site. Use it to connect with your friends and family members. You may also use it for your business promotion, enjoyment, social linking, & to grow your friend circle. Post some good articles and post some interesting material to get high traffic for your business site. Google + can provide you organic traffic. So use it and take your business on a new height. Wish you best of luck.