Hey +Bryn Forbes
Sorry it took me so long to get back to you. Its been a busy day. The honest and simple answer is this. It took me about a month to get over 1000 people. I shared, posted and was online a bunch. The goal to seeing more and getting more is the interaction. Above all things, be yourself... share content that you specialize in, know, are proud of... whatever it may be... find your niche and fill it. +Trey Ratcliff
does amazing HDR work, +Lotus Carroll
is a great photographer... but her niche is her titles.. they pull you in. +Colby Brown
is just one of the nicest and most caring photographers you will meet. They all have their thing... that thing sets them apart. +Eric Leslie
started themes here and Waterfall Wed is his very own.
So what I am saying is, find something that you can share that is unique or that you offer a different view/take etc on and make it yours. That will get you followers. Share your work, follow people and comment on their work. As you do more of that they will do the same.
It takes a little time. +Thomas Hawk
once wrote that its no accident has has the audience here. He spends a ridiculous amount of time online, shares pictures daily, does hangouts etc. So... people follow. His basic message is you get what you put into it.
My slant.. well its simple. I am me.... I tell stories.. about my shots, whats important to me, how I feel etc. I have a background that appeals to techies and artists alike and I am not afraid to show me... I dunno why, but it works.
I could go on forever... but every person I know on G+ that has a following has a thing or an approach that they call their own. If you find that and interact with others it all works itself out.
hope that helps =]