Social media optimization is best for increase good traffic.

There are basically many more method to increase traffic but some of them are very useful that I am also using to promote my site.

The first one is Commenting, Do comment on those site that have comment Luv plugin enabled, Join dofollow forum, share your latest post to social networking sites, join dofollow blog communities etc.

Few techniques for increasing traffic-
Advertise, use of social media platform, Focus on on-page seo, Use long tail keyword, start guest blogging & invite other to guest blog on your site, Make sure your site quick & responsive.

The best technique to increase traffic is SMO, SEO and PPC services. If you need immediately traffic PPC is best because these are Paid Ads displayed in front of the Search Engines. Through SMO also result quick traffic.