What are the best SOCIAL MEDIA sites?

Please let me know best social media sites which help me to increase my ranking in search engines.

Facebook, Twitter, Google Plus, Myspace, Linkedin, Pinterest are best social networking websites to increase traffic.

Thanks, nittish for giving me suggestion what about vk.com isn’t good?

We’ve already got another thread going about exactly this question, so rather than duplicating it, why not join in with Which social media provides best results?