The other way rather SEO is Pay per click ( PPC) which is paid advertising.
Well, I would say spamming is also an ideea. Not so ethical but very practical.
I've been had arround 10k users on my website just yesterday from spamming on facebook with articles from my blog.
pay to get quality visitors
Spamming is a way but could be a lot more risky and time consuming.
Creating an account on Google+ is certainly helpful, and social bookmarking to your website helps to spread the word around. I would also suggest social media platforms.