You can Increase traffic from social networks using the following techniques:
1. Create your company/individual page on social media sites like Google+ Facebook, Twitter, Pinterest, Tumblr, Instagram, Linkedin etc
2. Post regular unique high-quality content on social sites
3. Hashtag your posts
4. Update your posts regularly to drive traffic and reach your targeted audiences
5. Post your content on your social bookmarking sites like Digg, Reddit, Bizsugar etc as it is a way for users to stock, manage, search, and operate “bookmarks” of website pages
6. Add images & videos in your content engage more audiences
7. Create your own blog with unique content & keep it updated
8. Repost your old blog posts and share on social networking sites
9. Comment on other website blog posts
10. Guest posting
11. Forum posting
12. Infographic sharing & submissions
13. Engaging visitors with Webinars, podcasts Trials, contests, Offers& discounts on social sites.
14. Reviews & Testimonials
15. PR Article Submissions
Hope this helps